Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f41928a9895d302…

MALICIOUS

PDF

78.3 KB Created: 2021-03-03 11:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3bd9e2d7d89138c05afe9b8d7703332b SHA-1: 91aa10d46d1843009332f7a1ea5bfdb31848bc6b SHA-256: 6f41928a9895d302d353fdc33ff4995583058c394f91d66b9f7a7cb6b132d214
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or payload delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/123?utm_term=pride+and+prejudice+online+stream PDF link annotation
    • http://123dutch.com/cub_cadet_526_swe_manualbohnr.pdfIn PDF document text
    • http://voicebftyi.com/7628249110956zhi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/gghzJic/htc_one_m9_backup_to_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_6015567c2951f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_600149eacbaba.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/60540423688.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/bvgiJhb/monocle_travel_guide_berlin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fc56fd52a251.pdfIn PDF document text
    • http://nout-prokat.website/living_with_himalayan_masters_book_free_downloada7qsk.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/latest_covid_numbers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fd1aa4fd0559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fc978c35b958.pdfIn PDF document text
    • http://menbp.online/christmas_nail_art_stickers_uk5s6ul.pdfIn PDF document text
    • http://agencymedia-ig.com/free_ringtones_for_iphone_2020trg6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugugemo.atwebpages.com/fopapijiref.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/set_up_tenvis_ip_camera.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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 5296 bytes
SHA-256: 8badd7494c39c5e9a5c4b1577a12699d71dde519fbd42fcd20181f35e3c8bcb9
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10720 bytes
SHA-256: f947b2e39d8e33f90966488418b0fbc1fd607b279e7328f663f20ef409a596d3

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