Malicious PDF — malware analysis report

Static analysis result for SHA-256 8547be608093c1a0…

MALICIOUS

PDF

67.9 KB Created: 2021-09-12 00:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91029ad041d47a782143dc3ae9a27969 SHA-1: 0a06df2f6a1eaa1ffbba3d6c2fea19b396077e5c SHA-256: 8547be608093c1a0f36f748fd4e35cb7ad37e7e979268ebce26fcc2bc735954c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is described as a link farm. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=mi+max+3+rom PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lotifejimifinovekurevib.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/43060158824.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/37699175269.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/6639322461.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0965c605---wiwudig.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nurijujaloliraxetu.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/metob.pdfIn PDF document text
    • http://agilesolutions.in/uploads/60557155768.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/karikipik.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090620205364.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sobelo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd91be0317---11685657374.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/fogoguminaxiduzikifogasav.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/regotatalojetaleni.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/6702427517.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/83382887118.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB82 9988 bytes
SHA-256: 0d5833a5dd24d4dbbcd606b5a0a8bc6da968169907ed2e287ecc5616b246d42e
font_01_sfnt_off0000c1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 16220 bytes
SHA-256: 2a53c57642fb70ed9ede2258b3365617f96a266772d711629ddc5ca16f3d215b

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