Malicious PDF — malware analysis report

Static analysis result for SHA-256 744517ea9d429688…

MALICIOUS

PDF

63.6 KB Created: 2020-11-25 19:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 25e58aa0d93a9671e6751fa3014b9075 SHA-1: dcda63630a88513a367d24d15c42ccfd4059d27f SHA-256: 744517ea9d4296882c19c71de2ad7490212a14820514a3396c71583c58120d56
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a large number of external links, and a ML classifier identifying it as malicious. The primary external URL, https://trafffe.ru/strik?utm_term=introductory+time+series+with+r+pdf, is suspicious and likely leads to a phishing or malware distribution site. The PDF structure and embedded links suggest an attempt to direct users to malicious content, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=introductory+time+series+with+r+pdf PDF link annotation
    • https://mubuwejazanewa.weebly.com/uploads/1/3/4/5/134585617/lapikesunorev-mudozuge-digexex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5f9d503099e84.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/1864333.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/6863025.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/kijelopazekune/85664757514.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/sakawoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb48dffe-46ac-4eb6-89fe-115aa00ab977/13060896236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666c3900-78c1-497a-9bdf-55195f660923/jagomimol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83125e7d-5ad0-49d6-81dd-c8d3ab010db5/wuzofefopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3dcb33f-d1d4-4dc6-a533-f6e2800d61be/jufijit.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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 5284 bytes
SHA-256: 60197fa91d9f92143a3ccf457fa805dcfe7c7e6e724fb25ac0fa866c02f8e5ec
font_01_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 10232 bytes
SHA-256: c965b5068deb7a911ff620796c79d1850fb559e8160995902e6df3f4c9030196

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