Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec4ab56084e621f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 22:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5848fb350b88ca288d938a2752ad351f SHA-1: 91dca24e99aa36dd36bc9b2d813015384a86239a SHA-256: dec4ab56084e621fae64b3821b8a1b70f56cdda98176874983a366eb5d07a8e5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also contains numerous links, many of which point to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133e866540d7---boxube.pdf In PDF document text
    • http://muszempilla.com/files/file/pivojojipaborutavesu.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mejekutofeki.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/dodusofi.pdfIn PDF document text
    • http://darstin.com/userfiles/files/20260554930.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/30783682842.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/lazezivixatemivoxida.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/xafivogedinis.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/rigex.pdfIn PDF document text
    • http://sireny.net/share/files/sazexuwizefudamugovebajen.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/beletisaputat.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/94919507616.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/febuvulefujosatefodiropu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/gifudes.pdfIn PDF document text
    • https://mavibusiness.it/file/35537417062.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jimurefalevakoxasebu.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/40372210328.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d290a863---79759986655.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/3988823022.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210903184745_adafrl.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/72654653371.pdfIn PDF document text
    • http://csp.hu/editor_up/12243288258.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/koferura.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/goledogejawimojiwukesovel.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/17146092120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+game+batman+androidPDF 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_off0000b889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 15476 bytes
SHA-256: f3e464c34d0763880e98660117a5a0750b0935aadc1d8502e6507a9da7f3d4c3
font_01_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 10652 bytes
SHA-256: e8d4a85d3188bdae61c0564d7eb3ad87b41fb8ef02fed8c26bbc4767645bc17a