Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae848cfdc4299ade…

MALICIOUS

PDF

81.6 KB Created: 2021-03-07 13:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9176ba79b4f28870c8d841e376f6c9a4 SHA-1: 52a5bbcfb739162ec24e4ddfaddd1886f59be72e SHA-256: ae848cfdc4299ade744c6c6a90a0567cd81a523f238cf57c2027b489e38c18ce
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 0.9954

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://jumiwimov.ru/wix?keyword=cuentos+simpaticos+answers PDF link annotation
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/8330f54f017.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/Hgeg5Ll/racing_overtake_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_601833063c9ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_6028eb2f49149.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/jjihhge/8274109750.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/FibEghg/warlings_armageddon_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/hiXicMJ/guess_the_60_movie_emoji_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/xlfPgex/touch_mobile_facebook_promo.pdfIn PDF document text
    • https://xadonuxezi.weebly.com/uploads/1/3/4/1/134131919/9459965.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/Pwghr5i/23528784769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662220ae91.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/ghbhgge/58297836243.pdfIn PDF document text
    • https://milavunaxowe.weebly.com/uploads/1/3/4/7/134717052/wineba-mofuzikopem-mazelex-pibakon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_602b82f0a609e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_603ba5532f7b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393911/normal_5ff8b1bc8dd5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5ffc8169b4e87.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/F2hbmt8/police_chase_houston_sept_13_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fce96d72f1a8.pdfIn PDF document text
    • https://rifeseroki.weebly.com/uploads/1/3/4/6/134698736/3944c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5fcdd1c844871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowivopikuzud.epizy.com/mazifezawebevizixutaxoro.pdfIn PDF document text
    • http://zazuxidavo.rf.gd/urolithiasis_treatment.pdfIn PDF document text
    • http://wasamatebupo.rf.gd/tribe_sebastian_junger_sparknotes.pdfIn PDF document text
    • http://rekewam.rf.gd/schwinn_airdyne_ad4_repair.pdfIn PDF document text
    • http://koxepari.rf.gd/manually_update_adobe_flash_player_google_chrome.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 5044 bytes
SHA-256: 2b531cc1b162fc60126ae442f33b74eb1c8a87cd0db60409ed2b2c91f02bbe2a
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10700 bytes
SHA-256: 5eaa78e2225e988cce7d4b5e80df7380dded4fd7b06439bc63c559fc7607da21
font_02_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 16068 bytes
SHA-256: b87f97ee19d0eebf852dd88b0ab32469aeb165aad349e9abc0ff3cff3eb64326