Malicious PDF — malware analysis report

Static analysis result for SHA-256 4475d468ac1cbac2…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 01:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc88bd5651cc32b58a8456e01d9fc16 SHA-1: ed5849a3b3bd03f1b2bd20a3f9d473d5c821a535 SHA-256: 4475d468ac1cbac25384cccf212fdc67f0629d6eb30c2a1f85f520f5e884c804
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files hosted on link farm domains, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The embedded URLs and the nature of the link farm heuristic indicate a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=guide+rod+laser+sight
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/4732048.pdf
    • https://cdn-cms.f-static.net/uploads/4378604/normal_601964ddeeedc.pdf
    • https://sutomoloxoxe.weebly.com/uploads/1/3/5/9/135986515/201044.pdf
    • https://gapepaweduli.weebly.com/uploads/1/3/5/4/135400658/jifos.pdf
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/rinafilapakatuw.pdf
    • https://cdn-cms.f-static.net/uploads/4446649/normal_602721fa7471a.pdf
    • https://cdn.sqhk.co/fopikudapom/cejfSgi/20800599977.pdf
    • https://cdn.sqhk.co/tukawezezo/gdp4gdk/timufedaw.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_6033d9bb37f4d.pdf
    • https://cdn-cms.f-static.net/uploads/4366984/normal_603d98b8a0a90.pdf
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/2339617.pdf
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fddc7f627494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_570a76df114f494cad9876738cbb3b09.pdf?index=true
    • https://s3.amazonaws.com/farowug/72059038031.pdf
    • https://s3.amazonaws.com/rerinago/hms_victory_rigging_manual.pdf
    • https://s3.amazonaws.com/sasufufa/kebafavibunuru.pdf
    • https://s3.amazonaws.com/wenobagupexekap/58787001945.pdf
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_ed424fd1d6db4746b05ed85ae096ed29.pdf?index=true
    • https://s3.amazonaws.com/baxekojojexusol/melaleuca_compensation_plan_2020.pdf
    • https://s3.amazonaws.com/wizedumi/36255797423.pdf
    • https://s3.amazonaws.com/jevelel/roketofixazevova.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f455.bin
dad61a76c6f3cd34e328cc775f0859cbebb2636013daf27acaf5f5e02d52b1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5116 bytes
font_01_sfnt_off000105b0.bin
e9b300929b7f9a05a5b346deacae01013abad1b27fb37252246f31603a5e2a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 11904 bytes

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