Malicious PDF — malware analysis report

Static analysis result for SHA-256 1063cfdded600dcf…

MALICIOUS

PDF

79.5 KB Created: 2021-02-20 06:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d579401cf69366665dc0c925b9916b5 SHA-1: 7642a67ad4562df1ef90bcf9c0247d6112850e1a SHA-256: 1063cfdded600dcf9fc3b61fd732adec7e4e055d8d102b8ca5a5f7f71675b523
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=medieval+queen+painting
    • https://cdn.sqhk.co/gawagunikuw/lOgeyA7/33024863585.pdf
    • https://cdn.sqhk.co/puvegipuros/jecie0l/grimvalor_iphone_review.pdf
    • https://static.s123-cdn-static.com/uploads/4459477/normal_60018fe7d7171.pdf
    • https://static.s123-cdn-static.com/uploads/4383314/normal_5ff66a0e5ec90.pdf
    • https://cdn.sqhk.co/zetuzire/ujbphic/23104855005.pdf
    • https://cdn.sqhk.co/vipujitebiki/ghlhaTM/basketball_throw_cfa.pdf
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5ff3fd2aa1090.pdf
    • https://cdn.sqhk.co/sunomedude/9ihdhb3/redbox_locations_nearby.pdf
    • https://cdn-cms.f-static.net/uploads/4404730/normal_600a6659e527b.pdf
    • https://nijodumedogale.weebly.com/uploads/1/3/6/0/136082157/kopib.pdf
    • https://cdn.sqhk.co/feripamapuv/gujiGhc/relic_runway_game_y8.pdf
    • https://cdn.sqhk.co/mujawiru/iMgighb/forge_ahead_destiny_2_daily_bounty.pdf
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/pofixedomobak-bekixiki-durodufatus.pdf
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/5beb29ef0.pdf
    • https://static.s123-cdn-static.com/uploads/4380211/normal_600108aadb4c5.pdf
    • https://cdn.sqhk.co/sezunofubuzi/hfnxHje/13399508447.pdf
    • https://cdn.sqhk.co/wezupobuwab/dLjegje/siferexutoro.pdf
    • https://cdn.sqhk.co/fadejiweruw/RibZqhj/battleship_online_games_free.pdf
    • https://static.s123-cdn-static.com/uploads/4454179/normal_5ffb77f9c46e5.pdf
    • https://cdn-cms.f-static.net/uploads/4423155/normal_602eda07ea739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc08.bin
c9ebc6aa6c194727c3df67ecebf9ea89202b56854761875a402cf1257c357a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 5044 bytes
font_01_sfnt_off00010d52.bin
20614816e83d5e64a0f1a3c8221d8280ee09be2c9fad9a2c03d9095081f5e2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 10476 bytes

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