Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6ae815b63223ff…

MALICIOUS

PDF

76.1 KB Created: 2021-02-11 18:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e04d68690dd68283e3daf98877a79013 SHA-1: 0d54329db8488bbced6d257de20b159e774b9bc7 SHA-256: bd6ae815b63223ff43ab560dfbf067929eab44288a7184fc32396cb1251ddad4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=how+to+make+boxed+stove+top+stuffing+better PDF link annotation
    • https://cdn.sqhk.co/gediwuwanol/mChjjdq/19352848365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_601e80a219735.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/Gchbbgc/bozivuzewivewefenipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369493/normal_5fce3ebf97901.pdfIn PDF document text
    • http://bestplacefor.rest/frank_ocean_lens_v2_downloadvpymx.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/fhdih3o/99598833057.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/ijejaIY/kagek.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/ap107SE/buriseretiwagoki.pdfIn PDF document text
    • http://idealica-italiaoficial.site/atomic_bomber_full_apk_android_oyun_club5wm1j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493198/normal_5fe2a8ca51d0c.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/gcjaabb/tel_group_join_unlimited_group_link.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_600dd301148f7.pdfIn PDF document text
    • http://mists.space/3791826790ckne1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_601973568e49f.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/2f033.pdfIn PDF document text
    • http://atomlinux.com/tevar_songs_download_mymp3songhc4it.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 5712 bytes
SHA-256: e28fcd5b7904ac40394a6b02d6ac0641c2a824c35771767b285ff38a8d81bb00
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 13328 bytes
SHA-256: bf4a6f68abe5f109a38efde9ea7c71fa9758bd742ce92ba7e5d76940373ecaee