Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d640259f0d206a1…

MALICIOUS

PDF

83.2 KB Created: 2021-02-25 01:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dcd318ec19f8990fd69aae26ea70ceaf SHA-1: ce3e0a47a1479f3949c670ddd961b2714d0a2b7d SHA-256: 2d640259f0d206a166ece9bf91a6f3dde2ebf52d1fe1c98d528a010d4b255b2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for credential harvesting or further 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/award?keyword=trane+xe1000+manual PDF link annotation
    • http://particulieres-societegenerale.best/asistencia_uber_mexico_telefonofbge6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5ffca4ff0cecc.pdfIn PDF document text
    • http://paypallsecurity.com/106409913002r770.pdfIn PDF document text
    • http://puxegosabax.22web.org/how_to_load_pellets_into_760_pumpmaster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_6015537a4b8e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_6017c3cf7e3bf.pdfIn PDF document text
    • http://tublitalia.space/different_text_structures_and_their_exampleswhh08.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_long_does_fossil_gen_4_battery_last.pdfIn PDF document text
    • https://futuratolofuzup.weebly.com/uploads/1/3/5/3/135399438/b74ab2261637a8.pdfIn PDF document text
    • http://pornbustyvids.com/594600295760l8eb.pdfIn PDF document text
    • http://tumbochka.space/lavonuduxuvavi6oal7.pdfIn PDF document text
    • http://trokot-tonirovka.online/654136340518ppta.pdfIn PDF document text
    • http://nanolenka.xyz/can_daphnia_live_out_of_waterpfflo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd66f44b36f7.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://jumepenitujox.atwebpages.com/xavivokuzi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 4508 bytes
SHA-256: b0d2959f2b6a1f8750f74b56a98eaf95097e899f661a5717d18a8713c01e88bd
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 11268 bytes
SHA-256: 452e106ed9a63be20712d13e7cae98458c08c288a6b0edf3ff218a0d9404b217
font_02_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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