Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0853742389da02…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 13:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e896aac3664ae3abc1bd0a98237c87e SHA-1: 796355a32d7c39e47d1a9e9dbf01093f6841a5cd SHA-256: 7d0853742389da02558adaeffdf34962ccc3cd94e4b42d74208bceab72285f35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, and is described as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies it as a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/387f51c14be958afb31188fd95a3ba7e/79935862660.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c80834512---92960560852.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_6E077AFE37272156.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/jodadiliroxowoteviruk.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/99134704264.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/79315991695.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/99776217382.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/69736900788.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/65883667102.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/8680061357.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/14901332668.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/guzafolunuzowedapew.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/6986789905.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/jemitewunuraku.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/nopunojaxezi.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/85993798279.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/milomojariwejiku.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/3772433427.pdfIn PDF document text
    • https://mahae.hu/files/files/bajuzubegadutitefewu.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/77817911887.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/56589107277.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/famijodabikitoxa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/merigisokotadeka.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/guguvuzi.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/tuzexodijewexunufidisin.pdfIn PDF document text
    • http://soc-in.com/data/media/files/35593024317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=phoenix+wright+ace+attorney+justice+for+all+romPDF link annotation
    • 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 15916 bytes
SHA-256: f198d02e6271a19b60548f02ed2f32087476fb8ae2b23a3917c00328d32b5ade
font_01_sfnt_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 11316 bytes
SHA-256: bfc3ddca818219f476e5d8680c9b798ae227d0890ba7b2f7fecb1f79ee177353
font_02_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1