Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf2ea03e94b5e73…

MALICIOUS

PDF

133.2 KB Created: 2021-03-24 16:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ceedb88350b9abbcd48cec83986f4974 SHA-1: da154a13c74828a96497d859afd6f2fa9baa57e0 SHA-256: 2cf2ea03e94b5e73281490fa4f795caee3331c378ec069013b99c5ec8778b10d
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/123?utm_term=chrome+android+apps+page PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459170/normal_60148f284efc7.pdfIn PDF document text
    • http://vurenosul.22web.org/saguzonuxoludoje.pdfIn PDF document text
    • http://freshnatur.fun/veneginitavofaxofuc05gb.pdfIn PDF document text
    • http://bigchance.pw/18063267526z2erz.pdfIn PDF document text
    • http://alexandreablog.com/60102821280dqwp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_60210ae85b872.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/cbse_class_12_maths_question_paper_2020_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff098127b524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_4cbbdc80ae2a418d82254b67bb489ff6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/guitar_chord_chart_for_beginners_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c024e3-6f4e-43b6-8f0c-9b9f646f3de3/larafe.pdfIn PDF document text
    • http://netubufetolanup.rf.gd/l_ars_amatoria.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/cars_fast_as_lightning_for_phone.pdfIn PDF document text
    • http://vurorawoguw.rf.gd/what_is_a_centrifugal_force_aphg.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_52221aecb62d497ea22c22f52a455314.pdf?index=trueIn PDF document text
    • http://dokedajonanumi.rf.gd/32151574875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06764a2a-bb50-4e6d-b788-fa78938ba6bd/beautiful_disaster_travis_maddox_quotes.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_off0001cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF7C 5244 bytes
SHA-256: a3846789eb939c7b5225330abaf0748a79f97abaf9645e1e6acf1a9b73e34026
font_01_sfnt_off0001e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E11F 11376 bytes
SHA-256: 8a8e35a8e7303babec10f1edcf4ffcb25ce36df16797f4384dec1979073c2cf0

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