Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb26e1f6398a568…

MALICIOUS

PDF

93.1 KB Created: 2021-03-08 14:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 80b95005b8e49866a1175461ac35dd7a SHA-1: 1b7ea7372fda39abf64e238ad750a5a4ff87fa31 SHA-256: 7fb26e1f6398a5683f9d2224e0e23a8769d6b0cdeb356fd44efcf86af2f98fd8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=harry+potter+theme+song+easy+piano+sheet+music+pdf PDF link annotation
    • http://miwewumexurigan.sportsontheweb.net/dulugefibases.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/adele_when_we_were_young_lyrics_karaoke.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/xesexo.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/how_to_update_a_hs_mini_maxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_cd233f373df441c58ef9d4ce13277652.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/72916864629.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_e1eed48f73464f0db5f49fbc3120d188.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/puwasab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29d4ea8-b8de-4731-92be-d2eec8927af6/does_verizon_have_any_flip_phones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65824a51-858e-49e0-ab08-c67c058fbed1/79280124363.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_fc327c95238d47f58f8193bc0e5672a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b81ed8-95ae-4df2-9821-7771105041cf/which_harry_potter_book_is_longest.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_bdf120459ad14a8eb60982a64e519ecf.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_b861e5d4d5fb4c65b8adbde291b05214.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_d20b421893eb4ef88fa9bc92dd0afec0.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_119d0c7c94b04d8abe708d79e30315f1.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_a2cd67358a6a40a694f6debb124fa705.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6564218-24da-4b7b-ab7f-af90535906c7/dieta_de_uma_semana_para_perder_barriga.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/nipodosogewovimusol.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_e2c93bb540204ac1bef56cfd7741c478.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/angry_birds_space_mod_apk_hack.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_8aa8b5fa892b45ee80ea2c7d4a055522.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb3f216-f23a-426f-8b52-2e92b418586c/is_ge_profile_better_than_ge_cafe.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_d57b8eb7306e4225b48287800b43d9d6.pdf?index=trueIn PDF document text
    • http://lusajafimaneru.myartsonline.com/computer_science_dictionary_definition.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_1b559b318569408bb30d0dfde1a23393.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_30d0a0b566b6484380d4ab9a2023ad1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/employment_history_malta.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 5600 bytes
SHA-256: ab619c7217f73f6c90c5fe845c74d22cf82760537957bd63664e845836147559
font_01_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 10872 bytes
SHA-256: a77b79341a189bddda2e97b6e92d0e1ac30bbb36a552344f4918b4f273f222be
font_02_sfnt_off00015141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15141 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52