Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0577500c45093f7…

MALICIOUS

PDF

68.9 KB Created: 2020-11-19 09:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: baf5c939d9ec1232a1e06bbf4019ac1a SHA-1: ec5e3b72c3b4f8bc6c571ea6a919f5b5d697ff74 SHA-256: c0577500c45093f7894f09203f76e11aef683d482d178602d7d68fbaabf7106b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, identified as a PDF link farm. One of the primary links, 'https://trafffe.ru/strik?utm_term=back+exercises+machine', is flagged as an external URI. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

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/strik?utm_term=back+exercises+machine PDF link annotation
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/5416075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f8c1999912d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_5fa9ebf66c69b.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/wurijosud_zijukege_tipejikisef_bigaworuzile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fa56808ee0bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f88fa86e2bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f8b76ab144a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_5fb495316cdc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5fa1df78538c5.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/libeganot/wojideximirededodabejupet.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/ladof.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/watch_thor_online_123.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/toxic_substances_in_food.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/copper_chef_air_fryer_pan.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/gumokefuz.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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 5188 bytes
SHA-256: ea5c9d8ab8b5e142ef6fe410cb5e9d24b243e4454139f2a2ae100041d1250794
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 10744 bytes
SHA-256: 833ab1c9e1a8d92b4aa4e6d2e7682322ed430c62e52849eebe482839fbc2bd3b

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