Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e9f4047cd8ec4b…

MALICIOUS

PDF

65.0 KB Created: 2021-02-19 14:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ca8c53cacd3f6f4e51637dcebfdab108 SHA-1: 169ebe0c39d781d44b2934b8f77a905db29c6d94 SHA-256: 86e9f4047cd8ec4b935afe1320bcb067c91247e5d9126071115da34cdba0499a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://crophysi.ru/strik?utm_term=cessna+service+manual+172 PDF link annotation
    • http://detonicufficiale.website/634215465545mh8s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_5fe7d36952e86.pdfIn PDF document text
    • http://steelsho3.club/poe_golem_elementalist_or_necromancer9osv2.pdfIn PDF document text
    • http://mmmuuuue.space/interesting_facts_about_spain_cultureipl04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421770/normal_6002a7867e858.pdfIn PDF document text
    • http://natbeach.space/fisulukexeguvosujopdfgmv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368958/normal_5fdd297f82f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486035/normal_601f75adea169.pdfIn PDF document text
    • http://topcreditscore.info/grade_4_symmetry_worksheets_freeyh7wu.pdfIn PDF document text
    • http://ketotreno.buzz/zapafedarivuwukisamox6z3d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_602682318a1c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewasijibakel.epizy.com/postur_apbn_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/hatchery_mod_breeding_guide.pdfIn PDF document text
    • http://deniwejatugege.epizy.com/38669569153.pdfIn PDF document text
    • http://raxusitusumulag.rf.gd/i_am_the_lorax_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/68203466574.pdfIn PDF document text
    • http://dogugamegomijit.rf.gd/10893322095.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/waiting_for_godot_with_line_numbers.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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 5172 bytes
SHA-256: 88fca84d3f2425739b03d621d915d95d9846d96b794bad48d203484464ec2ae2
font_01_sfnt_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 8960 bytes
SHA-256: 7d9f8d695c79d957cc6437e20392961e7eb450634e90d364ca9d1ed3bf76a6c2