Malicious PDF — malware analysis report

Static analysis result for SHA-256 666610483e6370d6…

MALICIOUS

PDF

66.4 KB Created: 2020-11-11 12:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f6bf7ccf9b783f89d041c60003619cc5 SHA-1: 1caa0a8e2c3c54a4b695bc453797e4d006784b60 SHA-256: 666610483e6370d6b30fbd4de48711f28eceebb1e375ac7306500c81ebf1b8dc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the presence of a link farm within the PDF, specifically referencing external URLs like https://trafffe.ru/123?keyword=causal+argument+essay+topic. This suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?keyword=causal+argument+essay+topic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8b3967f2a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f88212590d26.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/guxibonin-duwasudozumi-vifudemewalela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_5fa7a594b36de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_5f96d5496a7b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5f920643a3ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f945c93e4cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f91a51d8770a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5f8df09e910d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_5faa5a031d4ac.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/noputoranaseza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/kuxewufebosametuko.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/rufisapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b064f7-1341-4815-81d1-39aa01c713c0/11429284130.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/sony_bravia_xbr_32_inch_manual.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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 5260 bytes
SHA-256: 928ee3a5fc494b81aadcca7aefeef32fc2a056fe81a6264a8cc440bf15331728
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10328 bytes
SHA-256: 379a2b7ee78181560f8643d0695004e1ebf95396a8a0a533d2d93b4d4b9ff917

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