Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecc9b3fb3501f67…

MALICIOUS

PDF

78.6 KB Created: 2021-03-22 08:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d803083d0669a058f31f7d8f4eb512c6 SHA-1: 488bb7e41643963a26bba995f524d862040987b4 SHA-256: 4ecc9b3fb3501f676a271b91aafd6912d69727befeaaf4728774f857f539af6f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. This suggests a malicious intent to manipulate search engine results or to lead users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/123?utm_term=callan+method+english+pdf
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/sewetuvat_xolutavalovifi.pdf
    • https://cdn.sqhk.co/dorusafe/ighbD2U/tadazotofi.pdf
    • http://medway24.com/falutowafebatiduxujub0h2zc.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6013bdbd7c220.pdf
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/7f0af7.pdf
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/binavofiwade_kezez_kimiwiguzaloden_fixulitit.pdf
    • http://loveworld.club/how_to_read_trane_furnace_serial_numbers4fsa5.pdf
    • https://cdn.sqhk.co/jotenitix/jjJCl8P/31510818956.pdf
    • http://difavusimope.iblogger.org/third_conditional_exercises_worksheet.pdf
    • https://jurisosisirebak.weebly.com/uploads/1/3/6/0/136086550/ferizezokafu-gexifub-zokibemiroriwas-zimuvuxivumimuw.pdf
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/fozikukore.pdf
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/tixamed_rowafixovur.pdf
    • https://static.s123-cdn-static.com/uploads/4478703/normal_5feb45ac2bf19.pdf
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/1505707.pdf
    • https://cdn-cms.f-static.net/uploads/4381539/normal_604d3068ee8c4.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/ac1b4.pdf
    • http://okclub.org/nujuzenenoko90ro7.pdf
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/2647141.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sumelisexos.rf.gd/jetikisomokiwozekol.pdf
    • http://buzeliri.rf.gd/41105347145.pdf
    • http://garonidu.epizy.com/menelurumegi.pdf
    • http://mifaneneveloje.epizy.com/49792238032.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a4.bin
a89f4889e9ed666f3252bb749e9f3c5b458ddf6c34404eaeeb6a12f96a0297f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 5264 bytes
font_01_sfnt_off0001066a.bin
e8720f05beec69a2da60ef921254102652f3b37d43dee083721552f87e1ba46c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 11424 bytes

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