Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d258dbf28d91b76…

MALICIOUS

PDF

65.7 KB Created: 2021-02-24 05:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a163b4bbed92acc16822e6255ffd4ce3 SHA-1: f162432cbeb7b42d5e44a1ae44d1700ca48ac391 SHA-256: 4d258dbf28d91b76c7043691c7b48e407260e230b53944a4a7acbb7078d1c166
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/123?utm_term=whirlpool+dishwasher+wdf520padm PDF link annotation
    • http://xonubevobupok.iblogger.org/challenge_bhojpuri_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/tejikeluz/giapBSf/nedusozisek.pdfIn PDF document text
    • http://pakepudowo.22web.org/audio_books_for_spoken_english_free.pdfIn PDF document text
    • http://craftsmansmetics.com/3407027859lng2g.pdfIn PDF document text
    • http://vitalia-transports.com/275628792492jbec.pdfIn PDF document text
    • http://expressvpn.store/99522923298azy4h.pdfIn PDF document text
    • http://brandframeb.com/police_car_horn_sound_download2edep.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/ggiehel/29904989035.pdfIn PDF document text
    • http://plafond.xyz/belmond_ellen_ragnarok_mobile_answerswx5mv.pdfIn PDF document text
    • http://losmopaka.site/malayalam_calendar_2016_mayuxikt.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/ad948d9a8550.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/rafiralexezol/4488171472.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/29464787274.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/15962290252.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/65511357733.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/lagu_kisah_cintaku_panbers.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_off0000c37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37B 5784 bytes
SHA-256: a0486dd1c3e50de1ce40fecf33c5ae6b10b54f3328f8a858f6bfa71c4a383aa2
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10244 bytes
SHA-256: 5c43226a0b47eb8749a6eb5017387bd0149b00b1b009aca7264d73ee9e4e277b

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