Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e92bc6c029274d7…

MALICIOUS

PDF

76.7 KB Created: 2021-01-05 04:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 67198bd09242e1d0663d84c670a95dc4 SHA-1: ef8388be4e6543083135d41eddfd97b50f72a388 SHA-256: 5e92bc6c029274d772255e03f4387709994977f00b9105622b5210880d719bdb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary lure appears to be related to a 'Smartsheet app store', directing users to potentially malicious URLs.

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
  • 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://trafffi.ru/aws?utm_term=smartsheet+app+store PDF link annotation
    • https://cdn.sqhk.co/kewusikata/jBkjghg/sogosibivebusolubejif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_5fb49c1828b3f.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/aifXg20/mountaineering_tent_brands.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/hegdgir/runescape_shark_outfit.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/rosoxab.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/4882161.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/4210d1a21179f2.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/zijezawad-xoregikamepivu.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/73e94fafa.pdfIn PDF document text
    • https://lixotesit.weebly.com/uploads/1/3/4/6/134655402/sosobisu-kobadikuvi-tukivune.pdfIn PDF document text
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/668659518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_5fe64e39dddbd.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/29545c00-a8f6-49a0-b688-4605688ce5c2/work_order_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3a7710-4ea8-454a-8802-82e3e5e212e8/tower_breaker_hack_and_slash_mod_apk.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_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 5132 bytes
SHA-256: fe94cdb8d3efbbef574e778fdf19e094413a7418e33e82d8927ca43c0444e748
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 10380 bytes
SHA-256: 86743d817227b95618881c19b796c9db83154562f0e8572e33cecc9fc8eb5e42

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