Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff653358f17a2e90…

MALICIOUS

PDF

95.1 KB Created: 2021-04-11 07:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 808498d30b33225f7aae3485a0cbd5ac SHA-1: c1ed5c265fc2dcb3d3a4f440d38ae11745dd6ce2 SHA-256: ff653358f17a2e906962b3102f4cc3a67b307e25cc9106d9c2ec2921495879b6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'dafemum.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users.

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://dafemum.ru/strik?utm_term=what+is+curriculum+design+in+relation+to+agricultural+education
    • http://ch-bewertung-2888.xyz/play_tamil_hd_movie_freeyvsmu.pdf
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5fc772c47ae4c.pdf
    • https://cdn-cms.f-static.net/uploads/4467975/normal_5fe68f3165800.pdf
    • http://kigurumi.org/53741227107bjb2q.pdf
    • https://static.s123-cdn-static.com/uploads/4411922/normal_6004c42c2e57e.pdf
    • http://digitaltoolsfor.xyz/jobedixugodmdaoq.pdf
    • http://emirofficialzm.com/electrical_safety_ppt_templatero2f3.pdf
    • https://cdn-cms.f-static.net/uploads/4464869/normal_602d0739ce9da.pdf
    • http://opros.xyz/86336272193x511h.pdf
    • http://bitcoins-profits.com/wonatirapudeneg4dz87.pdf
    • http://idealicaitaly-ufficiale.site/how_much_does_an_ethical_hacker_earn_uktmcxy.pdf
    • http://afracheat7.xyz/wujatinovmn1kb.pdf
    • http://lisolu.org/572636722258ikae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a248458a-00ac-4476-ba3b-6ef8a074a502/fizit.pdf
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_e6fcf2a9ae9b4721bef7a0d5fa17d0f1.pdf?index=true
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_942a16fd62ba4850a827558fedb1cfeb.pdf?index=true
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_4db790721af2410c8eb9a9921d493fe7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66a5cbc4-3058-453f-8897-58144869a77c/english_learning_center.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c0d.bin
53bcc0a8e5b5bd3ab38beda53b736ae6acfb9188d28e20c76602054159127a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 5248 bytes
font_01_sfnt_off00013dbe.bin
2fece573bdf6f68b5033c0eb590284c040918a016f48a4d8889ed837ac18d42f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBE 10212 bytes
font_02_sfnt_off000160bb.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160BB 4324 bytes

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