Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8f4b4bddea678a…

MALICIOUS

PDF

70.3 KB Created: 2021-03-23 17:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b204276591fb610a411c267a5f09775c SHA-1: 29f7e645169b073c8b00e831e4fefcf4d26fef53 SHA-256: 6b8f4b4bddea678a1945e1b8e31ba8f42c944cc623547546a19571631035e86d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm containing numerous external URIs, with a critical finding indicating it's a non-clustered link farm on disposable hosting. The ML classifier and ClamAV also identified it as malicious. The primary attack pattern involves directing users to potentially malicious external websites, likely for malware distribution or phishing.

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
  • 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://zajinet.ru/award?keyword=bisagra+hidraulica+bruken+pdf PDF link annotation
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/14697da.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/pamovebos.pdfIn PDF document text
    • http://merovew.xyz/60406825435kj4nf.pdfIn PDF document text
    • https://mezemefi.weebly.com/uploads/1/3/1/3/131384279/dotufuzafitozojave.pdfIn PDF document text
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/e16a4a21af.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/20xY6ZT/top_country_songs_2019_youtube_playlist.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/8211511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_6057fd841008c.pdfIn PDF document text
    • http://tryici.xyz/what_is_the_purpose_of_knowledge_tokruli7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_604817a4be59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fe722839bd59.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/ijhbpge/4221288935.pdfIn PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/xitadajona.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/0SgcVKD/vovalopomeg.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/0d297609-6da3-486b-88bb-88193db634bd/programming_pearls_first_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734c74aa-21b9-4006-afc6-ddb2abe947ec/64151387682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8006befd-b4b8-4b28-bb0c-c0b37e2db416/63148450412.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_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 5672 bytes
SHA-256: 24fce0daa1a04e7b800e929f7abec7a2c045cd45c77bcf8902b702f3dded66a0
font_01_sfnt_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 11628 bytes
SHA-256: 4208b9ffe8d6f29dc177c9f2ae8fbe0e833b45f01b64fa284af8ce133c48c79b

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