Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b97a3d1003c678c…

MALICIOUS

PDF

84.6 KB Created: 2021-02-15 14:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fc19dcc7c8e45e7301d4f5ba5717e46d SHA-1: 00e8a784c9eaceb60c5068b945215093c91d3abf SHA-256: 4b97a3d1003c678c2597202eb432401d6a0ff8c80122beba2c0e73a3d9fd8cab
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, with one prominent URL pointing to 'baarspo.ru' and a search term suggesting a lure for free programming books. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs and the link farm heuristic suggest the primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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/strik?utm_term=free+computer+programming+books+pdf+in+hindi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389616/normal_6002d06f6e4c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fcb18585335b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_600e42dd3ec27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5ff311613a2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_6018eaada79f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477651/normal_6016bac7998be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_60278edb0555a.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/93928573058.pdfIn PDF document text
    • https://cdn.sqhk.co/joxufejod/gchisjb/nasufoxuli.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
    • https://s3.amazonaws.com/subopukomanaw/blank_w_9_form_texas_2019.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/nejufel.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/wezelurenimukito.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/bibliography_examples_apa_format.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/side_menu_bar_bootstrap_template.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/joveka.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/geotechnical_engineering_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/muguzemaxefisuragifo.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 5576 bytes
SHA-256: d8a383bba815cbd3482faa292620d3325d4e9b65d7f46baa2cc80081548dad67
font_01_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 10880 bytes
SHA-256: 2e5ec56fb16a9bc1f1467afc5c34e3a2fa9cb8a4e5dc80c1a628b14b24696b6b
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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