Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9df2138d397166f…

MALICIOUS

PDF

95.4 KB Created: 2021-09-08 20:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14a1ff234b955307d336787374232dbe SHA-1: fad1fc73ac40eefdf537b6e9d18ebc3f2ebaf7d9 SHA-256: b9df2138d397166f60dd02709c8dffcf79f152b1d7998ad59a22f1471d6b09fc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=2009+jaguar+xf+premium+luxury+manual PDF link annotation
    • http://lecieldesandes.fr/ckfinder/userfiles/files/22368982256.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/32838862013.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/50958437998.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/39358099308.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/64918984255.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/lulimimezat.pdfIn PDF document text
    • http://salespate.com/userfiles/file/85647026611.pdfIn PDF document text
    • https://terracell.info/images/file/54845029789.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b90ace11---viwikudurexalobimo.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/kuzamajorekezobegoraku.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/lisadowasumiropitole.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mametokepezifomazobade.pdfIn PDF document text
    • https://panoramabyty.cz/content/39126347067.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/bamoxiserifafitagomijoxo.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/72988739098.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/fatugidakanigib.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/rodasokawupodizopiwo.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/vikopir.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/biwujigebatuwenodabig.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/91177500590.pdfIn PDF document text
    • https://best-label.com/upload/files/badarew.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/dumediberim.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/63128803423.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/nasejajuzidapabi.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_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 11072 bytes
SHA-256: fa7621636b69ed3a3d670d343eb991162a32b2f476e3d29b301edb593aa58202
font_01_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE2 19224 bytes
SHA-256: 6198099395a86e8e725fe39af700f0514269bf7f533a7f43d514fb33a29cca4f

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