Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba672a0e28d0913d…

MALICIOUS

PDF

66.5 KB Created: 2021-02-14 15:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e6b2ab678cc76d27e7c8928971ca70cf SHA-1: 25228141f4b8dcae5a2424fce79ae4e32e5ba9f2 SHA-256: ba672a0e28d0913da45a251fdb37d7ed7999442908aa0469aad6c3fb1cf558b3
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to disposable hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=happy+birthday+brittany PDF link annotation
    • https://cdn.sqhk.co/vesagivara/Thdihe2/rivubekemanuweruwabopixe.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hahshaX/fih_hockey_world_cup_2019_winner.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/9jagdii/viridiana_alatriste_cause_of_death.pdfIn PDF document text
    • http://metunobe.22web.org/63776507342.pdfIn PDF document text
    • https://gusefokujugox.weebly.com/uploads/1/3/4/0/134040973/9210db.pdfIn PDF document text
    • https://cdn.sqhk.co/fokolamezo/jdughUA/live_price_of_oil_today.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/f1276f8ac4.pdfIn PDF document text
    • http://kozojorakipen.iblogger.org/abbe_refractometer_working_principle.pdfIn PDF document text
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/1296339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd12d848f0de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_60185ccfdc441.pdfIn PDF document text
    • https://xakewalite.weebly.com/uploads/1/3/4/8/134882175/rewupujofuso_somod.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/5067857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokofenox.epizy.com/redusizoxab.pdfIn PDF document text
    • http://zasidolejilu.epizy.com/autocad_application_free_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/mariadb_rpm_centos_7.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 5040 bytes
SHA-256: ef7b6368b1a90e5f82b067badb8939d09b1fa30b4ce036973533a9d7af9b6577
font_01_sfnt_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 10044 bytes
SHA-256: f7960bc111489fe68ea263c69c3371cb0383727d77eda889aa2db4bc136462df

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