Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7b8c04299ad5da…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 01:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bf5297066332f2ffa8620f1d0c221c5b SHA-1: 7d8b212669c0ec379ad022970c32fffd56f36eef SHA-256: ab7b8c04299ad5da49c34674f7b2818770682e94f7f6af14d8f6ef01bc838c42
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm and potentially a phishing lure. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious or spam content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may also be instructing users to decrypt a password-protected archive, a common tactic to bypass security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/award?keyword=netgear+wnr3500l+v2+default+password PDF link annotation
    • https://cdn.sqhk.co/kefekawit/1VDqheg/red_ball_2_game_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rosubeno/t0Rmje2/car_race_crash_london.pdfIn PDF document text
    • https://vizipelijokefar.weebly.com/uploads/1/3/4/5/134512389/25344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_5ffba874a0a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_5fd98979dbb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_603b4c4534ecc.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/ghqyWia/juvizinuvizesomored.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/ihfjdU5/football_scores_2020_college.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
    • http://jixuwir.rf.gd/63044110478.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_hard_is_the_nclex_pn_2020.pdfIn PDF document text
    • http://bevamixebigal.epizy.com/kemuwarajuxikofasujun.pdfIn PDF document text
    • http://nivutegem.epizy.com/sikipanaxojutuked.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/sivegilusutoxomodu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 5728 bytes
SHA-256: 4fccf52962ae9c94872424f8793940e88c718df8eceb350af7722feb2888dae0
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 13468 bytes
SHA-256: 71cef859bc9272f23fab971032954b606d4127042ddd3b86aff2998359ea0d25
font_02_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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