Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2354e559653c7da…

MALICIOUS

PDF

74.8 KB Created: 2021-06-12 23:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b52ef3edfef7ec05892b99e705e8a94f SHA-1: 5ddf9e60541f4b5b6c4ff06c20950cf1ed5ad2d5 SHA-256: d2354e559653c7dae1ad356ff603a1ff14869cceecddab29899c5cf04e6b9c97
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/pbw?utm_term=warhammer+fantasy+battle+1st+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445879/normal_6064e9884195c.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/pigome.pdfIn PDF document text
    • https://wubugijesagaro.weebly.com/uploads/1/3/1/4/131437106/vatawesum.pdfIn PDF document text
    • https://vonefemupeme.weebly.com/uploads/1/3/5/9/135957005/788c0e2f65d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_60bfffb259054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_5fe9e1efb82d6.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/1d0b3b.pdfIn PDF document text
    • https://pobanuruwogijo.weebly.com/uploads/1/3/4/8/134882751/xodavasimad.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/76d34.pdfIn PDF document text
    • https://losikopak.weebly.com/uploads/1/3/4/6/134616488/f1a030dd90b262c.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/xatipenozetozedag.pdfIn PDF document text
    • https://peziwavadeba.weebly.com/uploads/1/3/4/3/134313506/deguzaxatija.pdfIn PDF document text
    • https://ninisezidopif.weebly.com/uploads/1/3/5/3/135391617/fiwaninaxiwiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ffcf5cd0f662.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/4482f7d98c0889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_6022ca70b1b28.pdfIn PDF document text
    • https://zinalojirade.weebly.com/uploads/1/3/4/2/134266028/jikosogul.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/9a6b9707-668c-4aae-9c86-f2c968444a92/43924016173.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144980640/numufuxobisulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99932556-8f62-4ad4-bb91-5a30f70588fa/netgear_nighthawk_ex7700_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c11101a-0804-4247-bef9-b8e7660a844c/the_heir_kiera_cass_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4a2ad6-a28d-4bb4-b1f9-1a5a4518d674/what_does_pecha_kucha_mean.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/f/35862107361.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 5588 bytes
SHA-256: a9ad5a072cc9232cd6d864199ae6577710225729681f4363830f6759ddef87d4
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 10808 bytes
SHA-256: e6681efce6237f266d5735b21e8fa3ec52f933d418b4c3b89fe414af6cc334cb