Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c873d17db05326…

MALICIOUS

PDF

87.9 KB Created: 2021-04-07 15:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 792559454e1795ac68368a27b389fc40 SHA-1: 2bae6ff3bde95a0639c907a2f0fc05ba206c1997 SHA-256: 70c873d17db05326ab09a0efa567836e48fb18f9131f11f33f0bc86509dbfaa5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mezovuduw.ru/wix?keyword=valdrin+sahiti+dresses PDF link annotation
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/2216008.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/exercises_for_hip_bursitis.pdfIn PDF document text
    • http://fakts.design/jopit822of.pdfIn PDF document text
    • http://wildber.store/linfoma_de_burkitt_y_vihnx5it.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/901487.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/pemudumases.pdfIn PDF document text
    • https://teguzefememefa.weebly.com/uploads/1/3/4/6/134609716/sukaz_zefesuremina_xepig_rekagezubipoxor.pdfIn PDF document text
    • https://vaguvijag.weebly.com/uploads/1/3/4/6/134610999/xapexepagijuvi.pdfIn PDF document text
    • http://affilateapp.online/tefererurazujuwedoxopelmk0o.pdfIn PDF document text
    • http://copyright-securityx.com/hiv_and_aids_education_care_and_counselling_6th_edition_downloadn5hyw.pdfIn PDF document text
    • http://ampinternational.org/bedwars_texture_pack_1._8hdt40.pdfIn PDF document text
    • http://shtampshop.ru/why_is_my_oven_on_light_blinkinglzx4j.pdfIn PDF document text
    • http://ndfnasg.xyz/663544420132s0hr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_4936fc6bc6824be08081ef6479380c8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a60106-cd7b-4b50-b424-bad8d604e705/how_to_get_letters_on_phone_keypad.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/bogisugeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479233db-c0d2-4312-a32c-bef1956b35c8/que_es_destilacion_fraccionada_en_quimica.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_21f5d85031d14e5e95ca0b48ac3155c1.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_6e92d184c233467ba57ddff3d9f702d2.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_2511c25a8c0d4a06ba760f128ac595d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a191956d-4939-4153-9a1f-2f3806b860c1/bevolagenifaronazak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01132edd-c716-4a3e-93ec-b7e7167ee1f7/long_langstroth_hive_-_free_plans.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 4556 bytes
SHA-256: 430560552cf33ce3f1879ff6ee596832f463a7882ffc2dca3883a2778dc6497d
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 2552 bytes
SHA-256: ec747380ed455cf36ff35f44a3d72eb2edb89dd25b1eed39a86b8ca55d0999e8
font_02_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 11424 bytes
SHA-256: 7fd6054fe8d0db1b9f71b48b9bf207ca4863b01f888e60840d480d4a1cb1828b
font_03_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 16616 bytes
SHA-256: eb49df985c863db098e5748d60751e0bdf461ae071a7d58dcfe3683d2a7c527c
font_04_sfnt_off00014338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14338 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333