Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5c031ed408a2b6…

MALICIOUS

PDF

79.4 KB Created: 2021-02-17 21:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0c635b5f00d8a8a14818c58cc9c871a1 SHA-1: 0033f8286a350de927d9a1c41955fc4e0b6cfdde SHA-256: 8e5c031ed408a2b6d349518ad0615ee140ef720c50cc6f4e9de48db811e5688e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. While no scripts were explicitly extracted, the nature of the links and the overall structure suggest it may be used to redirect users to phishing sites or other malicious content.

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://crophysi.ru/strik?utm_term=where+is+1+police+plaza+in+new+york PDF link annotation
    • http://natural-shop.info/nepilenepiwomijinus13c9p.pdfIn PDF document text
    • http://eagleaff.com/make_your_own_orange_simple_syrup9ad4o.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/hirBGLQ/53957976454.pdfIn PDF document text
    • http://biomaniix.website/ziruxadanutexaresemakubevk3mi5.pdfIn PDF document text
    • http://testrun.ru/jalezakivjlfoa.pdfIn PDF document text
    • http://on24-system.club/slope_distance_and_midpoint_worksheet1v7pc.pdfIn PDF document text
    • http://smartycredit.info/73659503566lbmhy.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/xihi7hf/nosalunavujimazo.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/ifphdLV/republique_dominicaine_carte_identite.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/9Bi4hbJ/vizegukevanitusudedu.pdfIn PDF document text
    • http://usesalon.xyz/comentario_biblico_mundo_hispano_completoo7t2m.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/jdljff9/3d_puzzle_game_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/ihhhjfV/rubimepigovajalapejafeva.pdfIn PDF document text
    • http://idealica-italiaoficial.site/charoen_pokphand_indonesia_annual_report_2018jkebf.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/0ZUahfv/dragon_castle_germany_location.pdfIn PDF document text
    • https://sobidomigo.weebly.com/uploads/1/3/5/9/135960899/aa7e193eeea0a8.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/bsshdig/54831666793.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/dibopedirosijugekun.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/hgENET0/linking_verbs_worksheet.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/rowilubeforafe-lusoxita-sejobiwiwumov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 5100 bytes
SHA-256: e184c719b8fc055855c0651d74f7bb109bde90844c0ff6308a36eab06e70d702
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 10796 bytes
SHA-256: 4c633727090d0ee970101bf6193683dbfad2b33bd5862d6a561247ec5c1c2165
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378