Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c9d7e9b5984411…

MALICIOUS

PDF

72.0 KB Created: 2021-03-01 05:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 209c529d728147e6f307860f0ee35c53 SHA-1: f7fea1fd0058a12fcdb47a8e434fee9e4e06fa47 SHA-256: d9c9d7e9b5984411572263204374b5d6e88980365893213ffa4d7c4c255cb289
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 hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://seumenha.ru/123?utm_term=how+to+login+to+microsoft+project PDF link annotation
    • https://mirebaxowani.weebly.com/uploads/1/3/4/0/134017623/fibivona.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jgeGU0r/90629841562.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/lamaxozo.pdfIn PDF document text
    • http://pitushok.fun/368030002353arz7.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/9516895926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_5fd75a25843ed.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/lubepiniwefapag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_600bb92db3d13.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/for_a_given_job_the_direct_costs_associated_with_the_job_are.pdfIn PDF document text
    • https://punobedu.weebly.com/uploads/1/3/2/6/132683181/3253758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_601af72b23cee.pdfIn PDF document text
    • https://nalimaxepizof.weebly.com/uploads/1/3/4/6/134662907/xinalejakadiraris.pdfIn PDF document text
    • https://talidifixuj.weebly.com/uploads/1/3/5/3/135390844/xuzexatelopig-xutuva-vemasibap-vufala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463529/normal_5ffbc0de8bedc.pdfIn PDF document text
    • http://itash.space/fluval_fx6_tray_setupx5jw6.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/dcrwUgr/domunevikugafituxetes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapizodipe.myartsonline.com/89757636006.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 5256 bytes
SHA-256: 8a88dc782267aa8d1143135de86c690f46a4646bb0b63bb57adbe9bdd2317773
font_01_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 11144 bytes
SHA-256: 0cdaf01a4c0bdc753384a8285f129e00fb0ca018efc2a84d3a9f853ffc4e1de1

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