Malicious PDF — malware analysis report

Static analysis result for SHA-256 0748967a09fe9089…

MALICIOUS

PDF

63.9 KB Created: 2021-02-13 22:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6dd6631df34f45b5f326c25a9d7b4a01 SHA-1: 2ad8147e8bac19ce31c9c29b8fd21659715c543c SHA-256: 0748967a09fe9089e1cb14bc9b520bf6386392955462d32e49efa490aad250df
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 pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to deliver a second-stage payload or redirect to a credential harvesting site.

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/123?utm_term=77hp+tracer+2+schematic PDF link annotation
    • http://jupowawixiz.iblogger.org/hemispheric_specialization_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/hiKeHji/throne_of_eldraine_collector_booster_box_contents.pdfIn PDF document text
    • http://mefeteli.iblogger.org/nesitegowilanaru.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/jchjmgf/video_player_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/GsoMjed/62743402366.pdfIn PDF document text
    • http://hookup157.site/senha_de_wifi_da_igreja_sudbcv3p.pdfIn PDF document text
    • http://activa-fb.com/draconic_evolution_crafting_guidehxxwv.pdfIn PDF document text
    • http://sewonmedix.ru/78188135655o7xo8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_5fd7deea56aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_602274f5d8218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dumudolaba.epizy.com/fopagenukuranuzadoro.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/95542031705.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_off0000bbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 5260 bytes
SHA-256: 26b8514eed96248f93e557b556ba68b091c8da329600911e1287f86c5102f0d6
font_01_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 11220 bytes
SHA-256: 707e60fe0b5a5a22436b38e7d9b653b85daf1881fbaf62b5ae46da3de2330693

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