Malicious PDF — malware analysis report

Static analysis result for SHA-256 8974e90b7deb32f2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 16:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a768c276a9685ec54c1eacba73be760d SHA-1: 39c4da9848f6714516f91443fab97960d0f58c12 SHA-256: 8974e90b7deb32f2070ab96d6b2a960accb95fa8750811da2fab4214a224cc3e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest the document is designed to redirect users to a network of potentially malicious sites. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/xesavip.pdf In PDF document text
    • https://408of53crownstreet.com/assets/media/files/wirugojizorilewese.pdfIn PDF document text
    • http://sbkf.org/files/files/nudibutasixatezijabador.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/30224638961.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/zimokewusixevolusom.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/190825886.pdfIn PDF document text
    • https://qnzar.com/files/nabimeg.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/19587392768.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/30242871147.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/70035524964.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///juter.pdfIn PDF document text
    • https://somogyplusz.hu/files/lepis.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_182608.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/vavariva.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/keweweva.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/49492497812.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/77093468647.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/rafivojogamav.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917034618680.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/lodigamujenelagumetusazi.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/jikizimibelife.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/juvojulofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=3+player+co+op+gamesPDF 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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 10612 bytes
SHA-256: 2d6d664ed6d76722145402a9b70810575dd29585d1a900251cf144f4159006c8
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 17940 bytes
SHA-256: 48f39dd0cf77b104c9663dd580dcd1229e5183eb63d1cd6a49f592d8824b0756

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