Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab850355a3c1e7b…

MALICIOUS

PDF

72.9 KB Created: 2021-01-01 11:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9c554eeaf28891300f643906f22e39ca SHA-1: b81bb40f774f9524f62f6a54b60246073da64dd0 SHA-256: cab850355a3c1e7ba367f90276957f44fc93afaa51d81eaf02de5eb4ccea8a44
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 flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary external URL, 'https://traffnew.ru/strik?utm_term=guidesman+3000+lumen+flashlight+review', appears to be a lure, likely leading to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a malicious intent to redirect users.

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=guidesman+3000+lumen+flashlight+review PDF link annotation
    • https://cdn.sqhk.co/mugejufunij/hhaHB6e/69612666046.pdfIn PDF document text
    • https://garokeresikiga.weebly.com/uploads/1/3/4/5/134584686/1556325.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/1658666.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/pSgigch/cash_frenzy_slots_casino_real_money.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1082d919-6c55-4dd5-b4bc-c486ade4761b/funcion_valor_absoluto_dominio_y_rango_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/gilavarupugid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655875f6-a4f8-4d3c-9e3b-e6deb0ddd74b/amaze_car_2018_price.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/98784547763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f028d0-2678-41f4-b512-51107836a9a1/xuzopizudufosazavi.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/arveloven_2008_retsinformation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37587ad6-2664-4553-b5ce-c81133c6b70f/introduccion_al_urbanismo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331df714-be99-4c05-a5a1-0fa60193e9ae/tapivujepopagak.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 5808 bytes
SHA-256: 12bdf2c5ef29e3b05dbd03477959b28858dfd1a1ec1b14faa35927e5f1e17d96
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 11680 bytes
SHA-256: 2f729d021dc8f3a1e453cf39f6de3e0a526e4fc5bccebf4f650bdf49cb3caea5

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