Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93f8178d5cca659…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 08:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96517e8a8754e8d2e842f6dac57a8c5d SHA-1: ea656d973acbe1035ea5b50d52f71301fd9d9069 SHA-256: a93f8178d5cca65922dcff1c1bee36a4316817419ecbfefedb2518e9244acd3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for credential harvesting or malware download.

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 http://www.tecs4.com/intranet/ckfinder/userfiles/files/97122878077.pdf In PDF document text
    • http://tavaszitura.eu/userfiles/files/nigadesuwafesowuzaxutupos.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/90445411558.pdfIn PDF document text
    • http://telecycling.info/files/file/tipozemisa.pdfIn PDF document text
    • https://langumeistras.lt/i/File/44935449324.pdfIn PDF document text
    • http://ilovestory.com/upload/file/63014386263.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/kibegijolovefen.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/30322777452.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210901054744939685059.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905152715.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5765b9fd1778244b98975613ce22ef0e/vedizagati.pdfIn PDF document text
    • http://infracsap.hu/files/file/rororiwiduvoluv.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091449141580.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/fafafovosil.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/10406301266.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/dukigabolipufavopexujev.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210908161107_mz25j6.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/86230784969.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sebogonepotitutijoxafav.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/64934002411.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/3390590078.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/galoferewa.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/91027620727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=imli+episode+1PDF 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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 18036 bytes
SHA-256: 91462618da8c8ebc6c8053aabcf0188787943025b05b53a101c98fb849daabc2
font_01_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 10092 bytes
SHA-256: d89c0b5ba35faeb9aa79ca5e91ffb9c6c9384d4d803f16a372de68e384ec0e94
font_02_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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