Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc1da074dc6d4b8…

MALICIOUS

PDF

81.1 KB Created: 2021-03-15 02:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 632f45b73fe8f42e1784e41114275727 SHA-1: 26afa7aed14969f619114fae8ce71faaaed16aa7 SHA-256: ffc1da074dc6d4b8b9f259852d6c46abd66aed6f18bb9ffc7a8f014ee554c5b3
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The presence of 'powershell_v1.0_virus.pdf' in the document text and the ML classifier's high confidence score suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://druttle.ru/strik?utm_term=vizio+vo320e+price PDF link annotation
    • http://jenerotisa.mywebcommunity.org/fishing_tackle_for_sea_bass.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/nKrjgco/13186392867.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/y89Myhd/deep_sea_creatures_list_animal_crossing.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/6L9C3hg/rebuilding_together_silicon_valley_san_jose_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/nopusixinid/ehi7PEp/design_my_room_online_free_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nerutamar/gdALhaF/wordscapes_level_8255.pdfIn PDF document text
    • http://nabizutun.iblogger.org/jidiresivuvopobut.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/YLjbNLB/youtube_rv_wifi_booster.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/sotatixorawi/uiiSiiP/67713512842.pdfIn PDF document text
    • https://cdn.sqhk.co/kewexezaviz/gcCiegg/95347817677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_602e4978a7008.pdfIn PDF document text
    • http://bopepon.22web.org/bubiroliwebatepunapefex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fd32b7961f65.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/gfjbjcn/34191281673.pdfIn PDF document text
    • http://nabizutun.iblogger.org/jidiIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_c23d2164c5c941388fba3ebcd8f961f7.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_27affbf4ea004ec3b85fab9212074b8d.pdf?index=trueIn PDF document text
    • http://jisijuvod.myartsonline.com/windows_powershell_v1.0_virus.pdfIn PDF document text
    • http://voderekop.rf.gd/consumer_reports_best_rated_suv_tires.pdfIn macro / runtime command snippet
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_2950cbf539b44d678c5d6718742c19fa.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_caa96bd801744d109d4a6a126e23b40b.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_1edbabe3233f495e8a5b320545003246.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 5020 bytes
SHA-256: 222c683a6abc161b75387e2bc4ffb74fab9af326cc2591baa149674183dd64d0
font_01_sfnt_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 10792 bytes
SHA-256: b93122ac6e13460e75a4e154daacc4f62314e3085185afe2fc3014e748541ec8

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