Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f71957abde703db…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 09:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1908c4df5c3d785f0af3005f76b26c4 SHA-1: 5794e4b076f38a9a7e351edf77365e4d75958486 SHA-256: 7f71957abde703db6839e79a2f61ce315413a2d8703c6c5e36c9d311502b0d20
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=denon+receiver+manual+speaker+setup PDF link annotation
    • http://blockingscenery.com/how_do_i_become_a_lash_technicianra6nf.pdfIn PDF document text
    • http://shop50off.info/xubalefimumadigiwuviwabec19q.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/lord_of_the_rings_return_of_the_king_pc_downloadgqs70.pdfIn PDF document text
    • http://datidino.iblogger.org/basic_cisco_router_commands_cheat_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutisigila/gabung_file_jadi_satu_halaman.pdfIn PDF document text
    • http://totofexux.epizy.com/chronic_pancreatitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/wevisemeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4807c08a-987d-4f6d-9bca-b353b140d998/witcher_3_the_last_wish_boat_stuck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65601048-1f09-45a7-8f43-6e5abb8647bc/shocker_rsx_bolt_speed_adjustment.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_ebbb89d5630d498c81aeab63700efb7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/r_s_t_full_form.pdfIn PDF document text
    • http://mibawojerasubuw.rf.gd/43986764457.pdfIn PDF document text
    • http://zarufutebere.epizy.com/the_assassins_blade_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d92766-9789-4d0a-9fcf-44c62fb97baf/18300915475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c50272c-ce60-4774-a716-fdafd875ab67/who_is_norton_in_the_pigman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4810641e-2ead-48f7-8aec-fc004435b7ad/death_note_movie_netflix_l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca085941-0734-4795-ba4a-ae74bb2ac871/ampli_marshall_mg30dfx_prix.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/77364422777.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_156f455c386f49d68f6299a7567e6f7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/nobuguxozedobomakixuzugem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61a4f3e-3b7a-413d-9fb8-ad5d8d1dd919/gusafugakajalurowelif.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 5200 bytes
SHA-256: 3fa83ed76e92746417afa6b7747826a73105c923ca0d6deb22fea72aea7e8056
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10552 bytes
SHA-256: df37074c7c2fc6f4f6541c5d7fa9222e5bfe3658ead77c6c6ab1e9ec2d3a9d2a