Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbb0c25ce273b30…

MALICIOUS

PDF

74.2 KB Created: 2021-02-22 22:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a92de5d53ba6446c4bf26dac40526433 SHA-1: 5493d4116f1ff9da2414170e26f1e84206553396 SHA-256: 7dbb0c25ce273b30fc8c2f5377e804dba5fb1dea71816efb740abe9604351e4f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. The primary malicious behavior observed is the presence of a large number of external links, suggesting a link farm or redirection to malicious content. While no scripts were explicitly extracted, the PDF structure and external link farm indicate a likely attempt to direct users to potentially harmful websites or documents.

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://seumenha.ru/123?utm_term=abebooks+in+cold+blood+truman+capote
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/9fb6c94f0e.pdf
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fce619d17d83.pdf
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601b31497f2ca.pdf
    • https://piroveda.weebly.com/uploads/1/3/2/7/132740505/didama_nagana.pdf
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd92d812b809.pdf
    • https://cdn-cms.f-static.net/uploads/4445125/normal_600a1344b868f.pdf
    • https://cdn.sqhk.co/batovafakupo/hbihifZ/12000106061.pdf
    • https://cdn-cms.f-static.net/uploads/4459182/normal_60180c7b3464d.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5fd81dc8ef337.pdf
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60251cd283930.pdf
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/rofomovulosojubozujo.pdf
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5fdd8e946d3b6.pdf
    • https://static.s123-cdn-static.com/uploads/4425916/normal_5fcb2c706fe4d.pdf
    • https://cdn.sqhk.co/torujazelome/gExigjb/gexejuwubovedubunapok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://luralopanatu.rf.gd/bodmas_examples_worksheet.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_off0000d786.bin
b637c5dc3476a45e97c0a4637e428faeb341a4a0d8f4dd2c7ca857c25aa1eae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 5292 bytes
font_01_sfnt_off0000e958.bin
d9d406262cfd2b296c4c4a24fcb0083b41bbbe7a37ff20ae50f09fe80387ac6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 11196 bytes
font_02_sfnt_off00010d74.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 4324 bytes

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