Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ba34653e7b916c…

MALICIOUS

PDF

68.6 KB Created: 2020-11-19 21:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1e48d85ef90a98354776dd854863670c SHA-1: b7f03308efc0ee993dd0f0c0bdff96e9f8578581 SHA-256: 11ba34653e7b916c6582c63bbd3ebf56ab95208303f1d186aba29f983fe16f58
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content that can be weaponized for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=hoyt+recurve+bow+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f99e19ef1837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_5fa79b8d32bb2.pdfIn PDF document text
    • https://gesunujas.weebly.com/uploads/1/3/4/5/134509411/650b95833ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f96a15b0acbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5fa1e45ab9b39.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/gazoxulux-damujuzoxod-joxabibugate.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/6825859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f92a3a8ad1ab.pdfIn PDF document text
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/00e7c36a69d.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/lupevor-fonitusirivom-boxep.pdfIn PDF document text
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/5111e0de.pdfIn PDF document text
    • https://zivawopoxiba.weebly.com/uploads/1/3/4/3/134355714/c56f9680a.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/f1fb4366-53af-4875-a3a3-948e33a78626/zelewaxefimixepubuwul.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/calories_in_common_indian_food.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/nulopizurazemukavuvovase.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/canary_island_date_palm_trees_for_sale.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AE 4728 bytes
SHA-256: c0b4ed8fc67c2e84848222486877804654c339629dc7b983d6145dba2cf68eeb
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 10808 bytes
SHA-256: 5059bdeea3b90d1c4d457e7caad87a377a5bd1f9f7575e63f7e21510cffd558e

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