Malicious PDF — malware analysis report

Static analysis result for SHA-256 db67d5adaf463fb2…

MALICIOUS

PDF

77.8 KB Created: 2020-11-25 04:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05737f1c5651c1c7e5b10a0204d05dfb SHA-1: 16cabb7c355a3d5634d9b678fe16299fc6d334c6 SHA-256: db67d5adaf463fb2fd6b9ce2bf9e814dcacd1e04754933e1f797bbc47569655a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafftec.ru/strik?utm_term=the+genetic+code+lesson+quiz+answer+key', is directly associated with the document's content, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=the+genetic+code+lesson+quiz+answer+key
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f95d9910240c.pdf
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/jiwaputimi_virijiziwadew_refudufa.pdf
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5fa0afcb9f6f9.pdf
    • https://cdn-cms.f-static.net/uploads/4448556/normal_5fb580657836e.pdf
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f8dfbc6b9875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/teximikamukubo/45900831391.pdf
    • https://s3.amazonaws.com/jovekus/free_abacus_training.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/nanoxu.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/43445376022.pdf
    • https://s3.amazonaws.com/xovekolamoxe/cross_section_earth.pdf
    • https://s3.amazonaws.com/xirixepo/kabaddi_score_sheet.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/92055059989.pdf
    • https://s3.amazonaws.com/kudowo/74799219799.pdf
    • https://uploads.strikinglycdn.com/files/e87d16b1-6ba4-4f16-9df1-504126343ddf/62839433267.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_off0000e536.bin
0369b6054a7b9feb4e8d00b5bc0d99395802b90d087a602a350ca46218734088
pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 5468 bytes
font_01_sfnt_off0000f7d8.bin
02d7f81467e8d0cf46b15dba894a368cde7ad3786fe5089bef7a8f6bd03d0c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 10696 bytes
font_02_sfnt_off00011c46.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 4324 bytes