Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccdaa1120e88a65…

MALICIOUS

PDF

93.5 KB Created: 2021-03-02 20:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7667732e0bd927533054f52c5609bde SHA-1: 5b79a5192f97864cfe5db456498435e381c4bade SHA-256: eccdaa1120e88a657bb9fe6656433bccc3576e303a6bb7b90819811c0b8b1a23
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to external URIs, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=what+are+positive+psychological+interventions PDF link annotation
    • https://bopisigo.weebly.com/uploads/1/3/1/4/131453919/496a34133226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_5fd7c05b1d1b9.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/muvudojakuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5febc49441ce7.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/dhfVkZq/11720042853.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/hoAhcRX/lenofuto.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/poxijapimulizimu.pdfIn PDF document text
    • https://tobubetabopu.weebly.com/uploads/1/3/4/0/134095895/rabovujowemikiw.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/14670042683.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5ff5f6902c275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410199/normal_60066897a58f4.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/gfhgEhF/35909832768.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/Bje19jf/fuketenokonujivijuba.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/duties_and_responsibilities_of_an_operations_manager_in_a_travel_agency.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/natixum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juzujodajemafa.rf.gd/43515467223.pdfIn PDF document text
    • http://rifezitivobe.epizy.com/cnc_programming_manual.pdfIn PDF document text
    • http://kititone.epizy.com/wusux.pdfIn PDF document text
    • http://zapuvem.epizy.com/voluntary_acknowledgement_of_paternity_form_south_carolina.pdfIn PDF document text
    • http://dowinoxerirud.epizy.com/gelufugiju.pdfIn PDF document text
    • http://radodazemiluk.epizy.com/2010_vw_cc_owners_manual.pdfIn PDF document text
    • http://tororixiranop.rf.gd/krups_coffee_maker_clean_light_flashing.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_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 5372 bytes
SHA-256: 033d562c21172285e1cda0711267fbec18a458452e7284108c3b35d65ca6560b
font_01_sfnt_off00013716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 15928 bytes
SHA-256: cc1d1449909ef3632767279df06e9479d33938e112b2b71157fb90fca01a7794

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