Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c4fbe6c3901a8e…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 15:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4a4a40f06e3fa8d6c21c47c2d5f29b41 SHA-1: 9f7ef68d7e426a2788e4ab43aeeacfb5af409c29 SHA-256: d4c4fbe6c3901a8e506cb023f370f90fd16bdc06ebe6eaa1c80b022026bd620d
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to maypoin.ru. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document is designed to redirect users to malicious content, likely for phishing or malware delivery.

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://maypoin.ru/wix?keyword=troy+bilt+tb90bc+repair+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fefc2649702e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5ffaa19c21456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5fca65a1c5594.pdfIn PDF document text
    • http://denazofumoxebo.iblogger.org/the_raven_by_edgar_allan_poe_questions.pdfIn PDF document text
    • http://vulifux.66ghz.com/nogimox.pdfIn PDF document text
    • http://manirixibuwoko.iblogger.org/gwent_witcher_3_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368958/normal_5fdecbd53e859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxorojero/msbte_model_answer_paper_summer_winter_2016.pdfIn PDF document text
    • http://kanisisasulaba.rf.gd/friendship_day_videos_for_whatsapp_status.pdfIn PDF document text
    • http://lupugavediroz.rf.gd/fuvuxunogumowatevonoge.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/16379916472.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/bazexalebuzaweroruwura.pdfIn PDF document text
    • http://zilaxeputeso.epizy.com/madina_book_1_notes.pdfIn PDF document text
    • http://tivupomemotet.rf.gd/birthday_songs_in_tamil.pdfIn PDF document text
    • http://bidusopevix.epizy.com/beyond_good_and_evil_pc_iso.pdfIn PDF document text
    • http://delozaroj.epizy.com/wolf_power_oven_manual.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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 5392 bytes
SHA-256: 1095f5839e6e4246a543d6415a965a935c7929d31e183d6b34bcaee51f1cee32
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10632 bytes
SHA-256: 1375c7278e4e05a1b51d2a9a7000c3cf9c7739a3e550c2a57396e31fbf854378

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