Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1524d4655b12c2…

MALICIOUS

PDF

57.1 KB Created: 2020-11-19 10:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: acf7c3cbd6b9de29f3e7cd8bf15837af SHA-1: 3298ccb0b3e72900462be62c1ccc23c68f8323ce SHA-256: af1524d4655b12c29985a3db67e87ec2a93f009e577032fd82a60e4b11e72899
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. The primary malicious URL identified is 'https://trafftec.ru/strik?utm_term=phb+5e+spells'. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to direct users to malicious content, likely for phishing or malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=phb+5e+spells PDF link annotation
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/7880335.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/446bc0a36280.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/9718526.pdfIn PDF document text
    • https://xonovezalewame.weebly.com/uploads/1/3/4/4/134489084/zoworelibe-wujisedojar-wowupenuguge.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/9225f5590a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5f97ae5f6f017.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/95533721c.pdfIn PDF document text
    • https://defusisiz.weebly.com/uploads/1/3/4/5/134599350/6b5c99780ce0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5fa0284e7d693.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/jipowumat/fudosiwasawif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc05275-6502-4ac1-9b26-524af09a699d/lifawarepezevotowijep.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_off0000a686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA686 4868 bytes
SHA-256: 1a0b6fa7f2f80d604269e6f10cb933486feefa590188690d4b75288843bf0922
font_01_sfnt_off0000b718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 9784 bytes
SHA-256: 331fbcdcb3f1d491035d48bb3132933382672246b2574f4ff84521a92bb88da6

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