Malicious PDF — malware analysis report

Static analysis result for SHA-256 967f8fce45b08ce7…

MALICIOUS

PDF

71.7 KB Created: 2021-02-11 14:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c3565c91cee37b9ac2bc46f65fe6bdf0 SHA-1: 251990bb02e946c515b466810432f071c0b37950 SHA-256: 967f8fce45b08ce722515555573ef079d1ebb1986c93fba99b77b79b365dbb0e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The primary purpose appears to be SEO manipulation or distributing further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://leonvi.ru/123?utm_term=feed+us+3+sea+monster PDF link annotation
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/tipewemubu.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/vaxeri-karin-pikaligikasaju.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/IijaB1P/12862331762.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/d860c86cc39a0.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/kojiwekubopewo-jijikudaf-madegunulav.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/jvqFn3P/mefonuluzowuxivakigokufe.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/fU2hghj/neviwakate.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/bac3ba3af.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/fFwFdVP/30098022054.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/4481826.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/iKih4Xi/33721595537.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/mugedujozo.pdfIn PDF document text
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/2d2f09b49cfe.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/lerekove.pdfIn PDF document text
    • https://cdn.sqhk.co/filumabit/qvd8Eja/ninja_dash_lite.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/5YjbGid/tegimivekot.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/b22ff50.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/3146247.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/04b066b8.pdfIn PDF document text
    • https://cdn.sqhk.co/jibibezeva/CjcjIbX/brutal_death_metal_internet_radio.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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 5060 bytes
SHA-256: 7878d30288029a6582c2fdcdfe50cdf43c3f1fb0b398d5e07104130a72afa2ce
font_01_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 10840 bytes
SHA-256: 8fe8a4aab00dbd7df00c6aae7ced12af073354e96df4f35709d66973d4e69f7c

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