Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6a1732ac780408…

MALICIOUS

PDF

88.8 KB Created: 2021-09-14 22:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 454734d23d11b127ae9023b0a006e357 SHA-1: 00cbbae2468430ccfdc7abb8b57a0c4553aab05a SHA-256: 5f6a1732ac780408aee1faceb7fe70573c5704361f1b8d8ca03dde6ba27163f7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using numerous links on potentially untrusted hosting. No scripts were extracted, but the presence of many external URIs is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=hd+streamz+smart+tv PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326f21ce0da---72715689246.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/13980658055.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/bawunabiwakikoravupitofu.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/mowarunoku.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb35c2049d---bewagal.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_71631_189.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/94520655313.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/30017901062.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/21934161493.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79507784928.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/xasowuziduvogotovojelenag.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/wonosagumovufaxabileriro.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/80268104194.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/jovuwojogudeberume.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/37842606815.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/41708766447.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/xapafixezoviperuvaruneto.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc65d48d---35833929787.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/saxaregetoxitenemexuvo.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090217070442.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/tuworizezajoriwivi.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wezekarebasixetumonurox.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/zibujulofileseteros.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_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 18368 bytes
SHA-256: 194e821d15a6343fe98b3f09ddab3915b217b2974e219a8a5c53f902ca6b779e
font_01_sfnt_off000126a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A9 10164 bytes
SHA-256: 04f7d76619dc792376fb3b3de2e89224bd8878ac880275096c4fa720f127deab
font_02_sfnt_off00013d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1