Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0abab9133a48475…

MALICIOUS

PDF

88.6 KB Created: 2021-09-24 08:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1884716e2fb4942d55c4f5c6827e8b0 SHA-1: b66db43ae8c87d0a63729d3dee8d10de5a15983a SHA-256: a0abab9133a484756eea1bf5dbefb509b44b45f43cc2cb1a3c341c48aabdf6c3
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identifies it as a link farm designed for malicious purposes. The presence of external URIs and the sheer volume of links suggest the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ruresept.ru/files/file/25365732220.pdf
    • https://letajicikoberce.cz/userfiles/file/65784673630.pdf
    • https://foodexgida.com/uploads/files/tegogafitubif.pdf
    • https://nhahangthanghuong.com/uploads/files/bexefumaxefesufogi.pdf
    • http://pileki.com/imgup/file/84211380662.pdf
    • https://kimansion.com/uploads/file/xedufobuvalofinesafisi.pdf
    • http://spbmedax.ru/sites/default/files/uploads/mebivar.pdf
    • https://tablouri.emilianchirila.ro/imagini/files/luwubumujusuxotonelezo.pdf
    • http://rollfactorytogo.com/uploads/files/megoxafegi.pdf
    • https://indirimlipin.com/calisma2/files/uploads/vexumu.pdf
    • http://michardardillier.com/ckfinder/userfiles/files/kivopatumebiwovanizuwabem.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e721bf6a.pdf
    • https://pepsima.biz/files/file/vadimufinakebulekemefe.pdf
    • http://wxmx.cn/upload/ckimg/files/202109120556214577.pdf
    • https://peoplehelppeople.net/uploads/File/68757575907.pdf
    • http://pereplanirovkaoblast.ru/pict/file/tofuxodelanixubozasunada.pdf
    • http://bowlingkillers.com/imgdb/files/xunipifilimumarebirut.pdf
    • http://atek-ent.com/upload/file/64688695350.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/34571570308.pdf
    • http://kids-ex.com/images/blog/file/40387621750.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/62816532995.pdf
    • http://adhdesign.de/userContent/files/20210901002633-mobiputevivowekag.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/lojokip.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/labagozojewer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+joey+season+1+online+free
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61c.bin
ac46e4b3fd7d22cefa5820bf9420423cb6b45587fac4f00512d35edf3d2ac9ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 10724 bytes
font_01_sfnt_off00010ec3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 16792 bytes
font_02_sfnt_off000126d5.bin
cf96b82476c9da32aa305dd081864d54c3fa918732dcf6346a26175844e04225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 17660 bytes

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