Malicious PDF — malware analysis report

Static analysis result for SHA-256 708bb2c1f1131a0f…

MALICIOUS

PDF

74.6 KB Created: 2021-03-02 21:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c103f279aca206f544101ca5a15d0b4 SHA-1: ba72a523e62a026f128bd9a20acf8b75be0bc0ec SHA-256: 708bb2c1f1131a0fcebb44c1a675511267bd6968d5229dbc736d6fc48bd692b2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as potentially malicious or unknown. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/123?utm_term=how+to+change+the+ribbon+on+a+brother+typewriter PDF link annotation
    • http://naturka.space/geometra_y_trigonometra_aurelio_baldorlvl4q.pdfIn PDF document text
    • http://newberginvestmentproperty.com/pavefilidopegofewunoxiji6dkgf.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/jgfibVt/19131919168.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/g3ihajg/57814828703.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/wGhhIXo/horror_stickers_for_nails.pdfIn PDF document text
    • http://serodot.iblogger.org/gorizal.pdfIn PDF document text
    • http://strapslap.online/240820334908ihrr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafozega.rf.gd/ruvidosenokidaxefiz.pdfIn PDF document text
    • http://gapuduta.rf.gd/alaipayuthey_movie_songs_in_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/java_video_lessons_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/57974028565.pdfIn PDF document text
    • http://zaxigadanu.rf.gd/amplified_classic_bible.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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 5280 bytes
SHA-256: cafe4140ab45b90fe28c356208e5a19e326fa923e651a67980c9523ddc95dd98
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10464 bytes
SHA-256: 515196a957dbdf220ca9e4725885cc799b92fc772a7ac32ad86b6b88db9d4c34

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