Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c924b4c3eb963f…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 22:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a22572b59f0610a443a4fb0a149fdbf8 SHA-1: b7bc9f4e64d51891bbb11b4d759d50a5a9045702 SHA-256: c6c924b4c3eb963f50670479b865bf5fdaa5f501ce169a13cefb1826becc6be1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant portion pointing to SEO-optimized content, suggesting a link farm or spamming operation. The primary malicious URL identified is dafemum.ru, which is likely used to host phishing content or distribute further malware. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=how+to+make+activated+charcoal+from+coconut+shell+pdf
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5fdacbdeb08c9.pdf
    • https://cdn.sqhk.co/besogevipadi/djaoigT/45970620055.pdf
    • https://cdn-cms.f-static.net/uploads/4393635/normal_60340f74d6b6c.pdf
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60446ede2da94.pdf
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5ffadeb7259ea.pdf
    • https://cdn.sqhk.co/xidupesijij/igfgetS/52676106724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d79a8503-5a56-44e0-811e-9d4594817e95/gavilijodevutid.pdf
    • https://uploads.strikinglycdn.com/files/6c299080-8fb0-48b8-b433-a86e7b864246/top_speed_of_a_kawasaki_mule_550.pdf
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_616326717d8149f2a04f5dab63e92da1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/020f543e-ec14-4596-9606-7c73e556d40a/50311592682.pdf
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_60e934034662426193a9ef5c0c1adb8e.pdf?index=true
    • http://lelekon.epizy.com/gefokegujojadapokutegepib.pdf
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_2fc1341489dc4e93a9b68074ffdc1e20.pdf?index=true
    • http://zevofelajasuz.epizy.com/38736068176.pdf
    • https://s3.amazonaws.com/wovedukevikov/does_costco_fix_computers.pdf
    • https://uploads.strikinglycdn.com/files/a9644179-4dd3-4f5c-89f5-6af9280f60f0/32543711187.pdf
    • https://s3.amazonaws.com/jemisajoda/dufinonodisogozido.pdf
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_14f6703ad7244f9ca4f9b2be25075e0a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/682d801b-5d9f-4cef-89af-bb5750eff04c/streetcar_named_desire_play_vs_movie.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a8.bin
636f4a44a641631d0b9ba95fba515206cae0b7fe016c8e6f217c18a0004f7d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 5572 bytes
font_01_sfnt_off00010385.bin
7c1bd5cde7621fd59f0e43e6b830edd463345c4a4ff022fae0eb20ab7efccd6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 11028 bytes

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