Malicious PDF — malware analysis report

Static analysis result for SHA-256 163ee5e382f89db0…

MALICIOUS

PDF

76.0 KB Created: 2020-12-26 17:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9db440c8349b30962860b17587c1bcd5 SHA-1: 781d78e1947b7841956c70fb6a9214916f25bd38 SHA-256: 163ee5e382f89db099738cad0da28a32d2c8141cbd70a5d51025d5b392ce9b5b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=skyforce+unite+wiki PDF link annotation
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/a8041c9f403477.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/gisajuzixete_leverokozamukof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_5fe72b55dcac3.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/9hjejfR/king_s_college_london_business_analytics.pdfIn PDF document text
    • https://xadupokunarufi.weebly.com/uploads/1/3/2/7/132710624/fokugoputatapofow.pdfIn PDF document text
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/9128382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f7e13f-6a8f-44f6-9c2e-1941ac2880f5/tufexovamakibozege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db57c6f5-027b-4358-9168-426e360ee351/lanadajojij.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/hotstar_live_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe305964-15ea-4ba5-853f-f71bc7e864e2/panasonic_vl2020_rechargeable_battery.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 4816 bytes
SHA-256: 554e5f5a5eeb0141c3514af5be800b70d3742a0a1d48175e75d1c152d237477c
font_01_sfnt_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 11628 bytes
SHA-256: 64d928b6387a831f25743419e8e664ca2db2c976d8dcce9a132f5b261d38a1eb
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16244 bytes
SHA-256: dc743b41e5c9b9e4d56ad8c22d1311c6eb3cecbc0d04401a7a33aeed2fa7944a

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