Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67095da6e6270f2…

MALICIOUS

PDF

68.8 KB Created: 2021-09-08 13:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08c2300951b6baefe8611f8aaeb554bf SHA-1: 3047c3ae1a4133af271106a12db65dde6eb7a09a SHA-256: c67095da6e6270f232dabaadcea42129c2280aad500a47901c678d6e9d33dd96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=surveyor+cv+format+pdf PDF link annotation
    • http://bet-balance.com/userfiles/file/nababopanekepinasemizon.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/10600055712.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/84463853829.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/maxuketevi.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/dofalozukerosobesu.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/naketemomozem.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/88395949806.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/pokiwopudiv.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/9981407398.pdfIn PDF document text
    • http://fluorescent-training.com/file/pigifudutarawukaboga.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/48572155319.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/silireluzuporarukokotelub.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/rekuw.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210906073414.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/gezajudigivesotoxeguvara.pdfIn PDF document text
    • http://short-story.ru/upload/file/sezofebovitepenarabesu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/41868178706.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/rufupinosig.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/9557443417.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/57139494887.pdfIn PDF document text
    • http://iknow.pl/files/file/41345402065.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/6495538614.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/31342627970.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/petida.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_off0000b096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB096 14440 bytes
SHA-256: d935c1104e8140255acda2619ad2c4586b5afa9b5ed04d6876398b4bce457c9d
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 10728 bytes
SHA-256: 2d5fd7a803f3cb3f0158c94afe0847cd3172a5456303b3c3d12e20e258b8c3bf