Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8963ba1757fcc82…

MALICIOUS

PDF

70.8 KB Created: 2021-04-27 23:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aa0870db800ee4424e60d89065c49be SHA-1: 85115f1480f53931d65fe2cc5ff1e81d182d72cc SHA-256: f8963ba1757fcc820fd8ff5e8ed08a17ae4c4c258c29635f91fc6eb3b9f257d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=honda+gx620+service+manual+pdf
    • http://xitnet.fun/pdf_to_dwg_converter_zamzarfb6qw.pdf
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/kekinav-nagefikefovu-nelet.pdf
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/zunekimog.pdf
    • http://naturwow.space/trombone_quartet_sheet_music3p7y7.pdf
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/5805dafa1c7de.pdf
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/burefasujibare.pdf
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/6b4fd3ce.pdf
    • https://bifuvabomefu.weebly.com/uploads/1/3/0/8/130814245/xegipo-xoxirojanedif.pdf
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/9cd6cb7957.pdf
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/xaduwabakiduw-lefevezugam.pdf
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/nasomenewijoki.pdf
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/15959.pdf
    • http://agent-ritual495.online/stihl_460_lawn_mower_reviewstd9bx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajeloninesitel/how_to_unjam_a_bostitch_stapler.pdf
    • https://uploads.strikinglycdn.com/files/02fe53ae-3e73-49b7-9d73-beeafea960cc/the_boy_in_the_striped_pajamas_trailer_deutsch.pdf
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_5f57b22387324f86b0414b4a0861d54c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6c36b29-9015-4a7a-95f0-fa5296a6f009/5_tipos_de_formatos_de_archivo_de_imagenes_digitales_mas_utilizados.pdf
    • https://uploads.strikinglycdn.com/files/436f7b9c-4200-4576-acff-40882bcf5d73/86727525051.pdf
    • https://s3.amazonaws.com/nevovumowa/hunter_irrigation_controller_problems.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_772419631eb741ec8036d2b244c06589.pdf?index=true
    • 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_off0000d2b0.bin
84de8dc67cc709dbdb0360b08afdf15af87202b91376173f223fa50255535bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 5992 bytes
font_01_sfnt_off0000e70a.bin
aee19d235d9efdf13519924bf5c285682333f6b81d7ead6be0121bc6794353d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10980 bytes

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