Malicious PDF — malware analysis report

Static analysis result for SHA-256 a086e4f630be4d6f…

MALICIOUS

PDF

86.6 KB Created: 2021-04-08 08:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1373d505fef5ea5c71bf84b60c92043f SHA-1: c28c777156dcb777a74d545abc4f1c3dc1b743f7 SHA-256: a086e4f630be4d6fdefaf87d838862d2e3b24f69caf7b22f2ba8b129d82c2517
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 0.9995

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://mezovuduw.ru/strik?utm_term=blue+clean+383+power+washer+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378606/normal_6027b2adecdc4.pdfIn PDF document text
    • http://nesadurem.22web.org/24875380850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375696/normal_6005351a60c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_602e3c6344c69.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/if8jigL/toddler_animal_sound_spinner.pdfIn PDF document text
    • http://dusixose.22web.org/ritetemp_thermostat_8050c_reset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_60033a229b6e4.pdfIn PDF document text
    • http://xalufabo.iblogger.org/94126914681.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/VjbStia/super_hero_creator_free.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://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_88259fa6d672475ca262c71c508465f8.pdf?index=trueIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_862118ef91a04285a7fea1ae3e45a08a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/feretezomegos.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/free_victoria_secret_catalog_by_mail.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_a9e49282b84d471089338ab6dde073fb.pdf?index=trueIn PDF document text
    • http://dimaninerif.rf.gd/python_3._6._5_64_bit.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_8461fbb2ee1f4a3c88c0115f865ffeba.pdf?index=trueIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_af1d123915fd464bba0bca293c4c49ac.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_b47b6b28d13c4c6d8d5ca905665850cc.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_e5fb84c8a3c048ff99f6a263b8354f5c.pdf?index=trueIn PDF document text
    • http://tuvivitir.rf.gd/automatic_process_control.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_800ef9242e5146e1960dcebf48987b28.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_95fd79788c6c4978a9e132e4956f64a9.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 5400 bytes
SHA-256: fab59207ebf206c22d3e47d18928361dae01bd9ec1b6925e7159bbcb01df629a
font_01_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 13092 bytes
SHA-256: 2b0112a4c3a6ee20deddcf27e6b43ae558331f167280a6c6e05acacd5259f845
font_02_sfnt_off00013ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176