Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cfdb5e73422cbc…

MALICIOUS

PDF

96.8 KB Created: 2020-12-29 21:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 15beed8d98f1121c1844aaf1f61f94ea SHA-1: 82ce716efac0b4709663a111e326c8ac508775c6 SHA-256: 85cfdb5e73422cbc353230121015581735e767196917b3a96f6a8c3d71808830
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to create a link farm for SEO manipulation or to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

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://traffnew.ru/strik?utm_term=lose+weight+story+game PDF link annotation
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/mafugipefatorezemuj.pdfIn PDF document text
    • https://joxiwawetesamiv.weebly.com/uploads/1/3/4/3/134306419/xavaro.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/202afc875b.pdfIn PDF document text
    • https://romadixisom.weebly.com/uploads/1/3/2/6/132681692/vojikimasugufiko.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/vesaniweju-fegib.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdfIn PDF document text
    • https://jizoneva.weebly.com/uploads/1/3/0/7/130738725/simof.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/legenapi/xomadu.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/lusaraferetis.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/95608384122.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/barsaat_film_song_1995.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/48242050543.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/vogigati.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_off00013f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6C 5204 bytes
SHA-256: 5f6defbc834dc9856fa9e4c9b9509dc405cdb1c570dfb5723f467cc422d7d168
font_01_sfnt_off0001510f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510F 10964 bytes
SHA-256: 743624cbfdd3d9a3446b42017eedd354459d489d9f40fcc3a511c697a79648f7

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