Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3cc7e76ee46266…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 22:37:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a77877b4685f0e417c0468657f6eeb13 SHA-1: 5aa78358d64ecd90fc5d123990101a7cc350d316 SHA-256: 8a3cc7e76ee46266e9e573f58b8fbef733eee6333f1980c19024aacd7ded13c5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, references 'Cabelas meat grinder parts diagram', suggesting a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xajibur.ru/aws?utm_term=cabelas+meat+grinder+parts+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473388/normal_5fd28cf3c3637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_6045e028b29a9.pdfIn PDF document text
    • http://academic-club.ru/asheville_citizen_times_contact_informationdoezx.pdfIn PDF document text
    • http://kvyovk.xyz/vsco_cam_filter_guideup06h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5fd887f60f128.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/dfpzXif/lusumibuguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_60409cf304928.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/nlTXdjf/78154544757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5ffed2c0ea8d8.pdfIn PDF document text
    • https://cdn.sqhk.co/bigokukanuf/aVR2hah/bala_bala_magadivoy_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/jdjiaHH/wheels_on_the_bus_go_round.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490125/normal_5fc86e9313ddd.pdfIn PDF document text
    • http://yandex-delivery.cc/puzejomanulq3bh.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gchc7hi/hungry_birds_eat_it_or_wear_it_challenge.pdfIn PDF document text
    • http://waystep.site/how_do_you_unlock_a_t6_honeywell_thermostatcgd5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd297252d202.pdfIn PDF document text
    • http://vwwv-avito.online/nikusuwofogoofruu.pdfIn PDF document text
    • http://circus.market/fekokuneferigabodifares6fhc.pdfIn PDF document text
    • http://websporizle4.com/8777653643351x7o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_600a3ad6cb6ae.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/gjb3ceu/95769984746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 5324 bytes
SHA-256: 9243ede5c066c508f5df71481deff2db0a8394495c197fc28ef80c64b45e724f
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 10608 bytes
SHA-256: b731cd6aa8fb291da6e1ae6827ad48a35d2116b65295745eb90c95ab4147bdf3

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