Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c114d29912bfc5…

MALICIOUS

PDF

72.0 KB Created: 2020-12-28 20:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6cc8fb901ca1a4b859d7abdb39551add SHA-1: b3278f2fb619ffd90dd1b8686a1f7056f19ed565 SHA-256: c4c114d29912bfc5c96e2e75485408e1caae6a9b550481f0f1bf7b47655ead27
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content, likely for phishing or malware distribution.

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 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.
  • 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://trafffe.ru/123?utm_term=metaphor+simile+personification+worksheet PDF link annotation
    • https://cdn.sqhk.co/sewetotab/shhtieQ/18391566907.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/cghc8Wv/dreamer_supertramp_lyrics.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/3ceddfbedcde9.pdfIn PDF document text
    • https://vurebinavusim.weebly.com/uploads/1/3/4/7/134714178/3d9f1cc0a998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fc30c9b151cf.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/9aa5de31-f9b2-49a9-9625-91c8c4def3c4/a_child_called_it_review_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18288203-d695-4b8e-9266-d129652ec3d2/fallen_london_election_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/fepigogodanaxumowitozidel.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/pneumonia_anak_idai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534f48d7-f2e6-4439-ba11-6781e697ca53/dbz_android_16_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f9415d2-d941-49ec-a6de-5c0d863fefce/85767073611.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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 5416 bytes
SHA-256: 84f8f26a770dccef5897e3dab275d30480f750f2e09913084947fc2ceb2b6638
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10468 bytes
SHA-256: ae27426dfcd0855f1bfbe7de2f2cab3b5e985af9f53a7b527a63749bc5b2eba2

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