Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b91e315e16c227…

MALICIOUS

PDF

66.8 KB Created: 2021-03-23 00:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4693bb112d076e5293d9e3cec00c09b7 SHA-1: a3ab75598e601cd2a3af51a2614059923a1301de SHA-256: 82b91e315e16c2273d3319994acc1ebfbe565985120b62932bf566698582a844
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one specifically mentioning 'payment request form uvic'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=payment+request+form+uvic PDF link annotation
    • http://callup.today/dapazevamavukinekufay0es7.pdfIn PDF document text
    • http://itsnat.space/caught_in_the_rain_song_freesnqzo.pdfIn PDF document text
    • http://artelamp.store/stunt_car_3d_racing_maniacsts5i0.pdfIn PDF document text
    • http://busforpay.online/58589559765w1imn.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/Jjgfjgq/sonny_gray_yankees_trade.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/bTYpia3/xuxifepiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475738/normal_5febdb00dbbc3.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/igigi8P/dingleberry_definition_oxford.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_6024638121041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d52196-dfa4-4c4e-b048-6cb1772df5fa/67420647126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6b5f40-5365-4cea-96a1-0cf9d69e86c6/doxaselavegipemu.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/zivimupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62788026-f331-4ba3-b567-1c03f5f35930/mercer_cost_of_living_ranking_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6cff5f-9877-44b9-bfdf-acedb6a14bb1/maxajezesorapimadifofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c33463b-ada2-4fd4-b018-e7a5cc3e3660/directv_music_channels_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/reith_inform_educate_entertain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ec2966-f50b-4afb-a985-e10637019d2e/vampire_diaries_cast_season_5.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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 5284 bytes
SHA-256: 5fa05ce5a2dc448b4c539b8d04381030a57f46561d55ce67f22d753fea55a9ca
font_01_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 10672 bytes
SHA-256: e824261b1ebcf0882043e4d34d3ed1ef6e02dd516e06e7191a30b1348accc5da

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