Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4272b09302de63…

MALICIOUS

PDF

72.2 KB Created: 2021-03-14 23:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dee27694dfeff05ed360352da9c540b1 SHA-1: 43571c5b51c1d11bdd2e79425706f83f8e2a51c7 SHA-256: cf4272b09302de631dec3c36108d885eabc7f2577767aba26928bd243abee921
126 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. The document contains numerous embedded URLs, with several pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly support this attack pattern.

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://botokaw.ru/strik?utm_term=the+raven+edgar+allan+poe+deutsch+interpretation PDF link annotation
    • http://twobigs.space/pawan_raja_bhojpuri_moviei0rlu.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/pumavuziwodod.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/linisotun_repogavatepotab.pdfIn PDF document text
    • http://sfhgfje5df.xyz/dupeveguwikgsck6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_604ca16f40a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fdc1011f1346.pdfIn PDF document text
    • http://poguvezi.22web.org/xavovepifafanuzasumoxexa.pdfIn PDF document text
    • https://tevuluzusat.weebly.com/uploads/1/3/5/3/135397550/2739257.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/xopumomekafipupidug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5feb7e3e269a9.pdfIn PDF document text
    • http://yachtcharter.group/72569413185fe7ma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_60480b1dbbb88.pdfIn PDF document text
    • http://shoplus.info/best_free_star_finding_appnqw3h.pdfIn PDF document text
    • http://good-production9.site/can_physical_therapy_help_degenerative_scoliosis9un9i.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/7058679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_604463d44b725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixumijegaf.epizy.com/59314733585.pdfIn PDF document text
    • http://rizaraj.rf.gd/6368330313.pdfIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_7aa8e3187d7249ef874118feb007d085.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_ae87127129b24ed782580f63b7b71a58.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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 5344 bytes
SHA-256: a1664f9f2e4ceb8e28f58c8e8df9b9237ef4f6ae2a9c1b9fc6f6fb4649f061b4
font_01_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10520 bytes
SHA-256: 274da3cc56dfdc756dd70881f7e67d62aee21118011c79f0d8f24f1ac990a2c1

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