Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3523d5dff404b52…

MALICIOUS

PDF

82.2 KB Created: 2021-02-21 10:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: df19b29b43186ff6f61c00202062b912 SHA-1: ba8e61a509ebdba15c3182f68f42f365ddf58c3a SHA-256: c3523d5dff404b527f22d01af1e455f925483069339d05ee738ea028b5b21e23
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs suggests the document is intended to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

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://jottigo.ru/strik?utm_term=thule+bike+rack+installation+hitch PDF link annotation
    • http://spindlndou.space/svt_6me_tableau_germination_lentill3yfxw.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/2296090.pdfIn PDF document text
    • http://beremoter.online/8092718297368mmk.pdfIn PDF document text
    • http://forexgeeks.net/cecil_textbook_of_medicine_26th_editionpo4n2.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/dojotag_dubedulupolo_nufubuk.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/4jghpbE/fexulebatejapuzubulela.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/oieidVn/sivosize.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/jasajajupotum_wibel_vikulorifi.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/46445886850a0cxk.pdfIn PDF document text
    • http://static-start.top/tigag0ld8f.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/watajive/osrs_hidey_holes_guide.pdfIn PDF document text
    • http://dobupefibukin.epizy.com/bellavista_ventilator_service_manual.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_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 5040 bytes
SHA-256: 523981399d9033d657c3fc2238d4a2a3c8aa183478546f6eb44dd6390a4cd32e
font_01_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10664 bytes
SHA-256: 5ff14f3476581095ba6500fbc135e32f0bcebcbcc07c8e91519d2a55d69eab2a

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