Malicious PDF — malware analysis report

Static analysis result for SHA-256 6196d651a92dad17…

MALICIOUS

PDF

62.0 KB Created: 2020-12-26 00:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 84ca6af1ab4209dc7a4e8aff189746e9 SHA-1: 8280e88f1d930a5291ea9272641147b7feef0771 SHA-256: 6196d651a92dad1771fc19aa188e52e89e6237bd27a4a47f78783872b5e5a581
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links pointing to disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://trafficel.ru/strik?utm_term=crazy+pixel+apocalypse+5 PDF link annotation
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/1d5b426d665452.pdfIn PDF document text
    • https://ponopuxebi.weebly.com/uploads/1/3/4/3/134365602/d66672ce2fb1b21.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/lazojebono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_5fb8664defc75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5fb8f0e48671a.pdfIn PDF document text
    • https://koxarakofawel.weebly.com/uploads/1/3/4/3/134310925/1026289.pdfIn PDF document text
    • https://xiwapidijiz.weebly.com/uploads/1/3/4/5/134511693/dutuzuvodo.pdfIn PDF document text
    • https://getariko.weebly.com/uploads/1/3/4/9/134904460/2881048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5fabca807e465.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/nademopor/makilozademofixab.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/zisagugebiduzafodaji.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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 5176 bytes
SHA-256: 73fca05a4061b81209370c2296bddc179b57077508ec09d52a7d574f5a3d397e
font_01_sfnt_off0000c6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E3 11432 bytes
SHA-256: e4ca026b71002c2fbcdd080db389d3b983c662bfafac666f141af898fdb63499

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