Malicious PDF — malware analysis report

Static analysis result for SHA-256 b925e51687964f0d…

MALICIOUS

PDF

69.4 KB Created: 2021-01-20 00:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d18d209ca89aead631e764824fb52afd SHA-1: d57a1805d768bf69ae937c6ac7e18f3fc23b3f42 SHA-256: b925e51687964f0d9d16587b5861447e603e5e1e65d62f932eb5b5678f804a10
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or known redirector infrastructure. The heuristic firings indicate it is a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the ClamAV detection suggest it is a malicious PDF, potentially exploiting vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/123?utm_term=mbta+haverhill+line+inbound+schedule In PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/monupubewufobivod.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/gdjdsif/ninopojupubumupi.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/rhghbha/zobor.pdfIn PDF document text
    • https://rejafolurolege.weebly.com/uploads/1/3/0/7/130740622/5076578.pdfIn PDF document text
    • https://veworokog.weebly.com/uploads/1/3/1/6/131606039/9613084.pdfIn PDF document text
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/nufuvidaluzeb-somizepiburimi-gewitulimevad.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/dalerakukixira.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/nijavazixixek-neranezukoredem-deduvodi-tivukusa.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/ria4hfS/vaxuvosoraxesubirozukubap.pdfIn PDF document text
    • http://kokofiru.22web.org/lolad.pdfIn PDF document text
    • https://sozejaras.weebly.com/uploads/1/3/2/6/132695734/faveritibexefid.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/gjin3ij/pc_building_simulator_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/rdcXjjK/namijuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/jihaicF/hollywood_box_office_collection_wiki_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 5232 bytes
SHA-256: 5b62bdabfc3fda82cc463dd72d8e1480f4bc76ab7fd6fc387671fb4c3f8cab28
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 11104 bytes
SHA-256: 05606a71c5fa2ff97b38ba2b6cbbe41c080dfc5708c22e921ecc27a88206d8f4

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