Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad29a1cb75dc81c7…

MALICIOUS

PDF

86.0 KB Created: 2021-03-07 18:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8a6b0fad4d31236543aab3c683a011c0 SHA-1: 303a9193f06b2da02067bbe91ccec383af6cb14b SHA-256: ad29a1cb75dc81c74a1d9a658a2844ce5ce103c6f9765b0c3235a61fedbc4bd2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the sheer volume of external links suggests a distribution or redirection mechanism.

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://jacksth.ru/strik?utm_term=star+trek+enterprise+episodes+season+1 PDF link annotation
    • https://cdn.sqhk.co/lufelumad/igidijg/rotator_cuff_muscles_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_5fe96c048a99b.pdfIn PDF document text
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/lixodul_xumux_mumida_sogagelusik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5fc6a7d51f557.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/hdg4Jjf/pomobelewusof.pdfIn PDF document text
    • http://copyrighthelpcentral.com/91452660871ifuiy.pdfIn PDF document text
    • https://notemuwos.weebly.com/uploads/1/3/4/7/134717082/jovedojizugezap.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/Ehegjhh/zombie_tsunami_hack_level.pdfIn PDF document text
    • https://penugevofubelig.weebly.com/uploads/1/3/1/1/131164238/roxijaguwujo.pdfIn PDF document text
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/745c8.pdfIn PDF document text
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/8787942.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/tazewawazazopinav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fe90f29b707d.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/634446b7.pdfIn PDF document text
    • https://pabarasoziraw.weebly.com/uploads/1/3/5/3/135324669/2610268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd68c1d9eaa1.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/dRggfhf/global_warming_definition_ap_human_geography.pdfIn PDF document text
    • http://shopsmmv.site/scott_foresman_grammar_and_writing_practice_book_grade_4dux9p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_395032294d2242d5a7337c327fb0aacd.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_c1f5667de4df453588e90cc07744c6a8.pdf?index=trueIn 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_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 5140 bytes
SHA-256: 34233fa0bc85f7d023ccd2cfc65cdb9ad841b7e800ee003ea6c2f078fef39611
font_01_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 10344 bytes
SHA-256: e37f5328631cad8cf4942c694611d3e9fe88b221a94c74dc8b33aef9b14cb857