Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab491408c5bdd824…

MALICIOUS

PDF

153.0 KB Created: 2021-09-16 18:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb475be3d1ad6af064f0dae26593e4d9 SHA-1: 45bd95327ea0b2cffc304945472c55afaca4ffcb SHA-256: ab491408c5bdd824c43c9ac085084f771f7666ff105665e718854c8c070e42ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, but the presence of many links suggests an attempt to redirect users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://tivati.com/uploads/userfiles/file/2456868611.pdf In PDF document text
    • http://centroolosprato.it/userfiles/files/zulibonevaviwafajopomivog.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/vugewe.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210915235435.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/budarejaduwuvodirigenokuf.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/tedanefaleluguwugituwi.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/guwalokejug.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/60058206045.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/61279305452.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/82557557865.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/44984368086.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/44999821511.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/gifapogikosu.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/zejonededalaruvozoxedud.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/76655599571.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/kepakenanenar.pdfIn PDF document text
    • https://salonrewards.ca/images/file/18757746079.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/45fb94dd2ba608ff7e10d42edd2fd120/48111597288.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/34542352407.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/nivavonivozaz.pdfIn PDF document text
    • http://belst.by/upload/file/xuvazeforivemubumakov.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/75208563494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+note+9+font+stylePDF 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_off0001e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E872 23520 bytes
SHA-256: 2b219ecd636465b60c816e73d0fcd835bac92522d2c06fef21c3b49e40526c31
font_01_sfnt_off000225fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225FE 10580 bytes
SHA-256: 3685078ad298a2415e8d30a4302e544b6f2b06f4d2156c3f81fe1953a1139937
font_02_sfnt_off00023e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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