Malicious PDF — malware analysis report

Static analysis result for SHA-256 c324ff1a02b40935…

MALICIOUS

PDF

60.8 KB Created: 2021-01-12 11:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fa65f71fff987dbbe6b964920d97e3d6 SHA-1: c72de854f4f6f6aa2df1613bfc5c314580ec8248 SHA-256: c324ff1a02b40935e341390eaf986073497b9e869e1b560174775d93a3499d44
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external links, many hosted on disposable domains, designed to redirect users to potentially harmful content. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?utm_term=karaoke+night+party+flyer+template PDF link annotation
    • https://jesuzexujugom.weebly.com/uploads/1/3/0/7/130776612/muvomemixosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_5faaaedade68a.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/giq4uhg/schema_electrique_d_un_alternateur.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/gid2geQ/epic_games_chinese_investors.pdfIn PDF document text
    • https://cdn.sqhk.co/nunologen/FLjehcz/where_s_my_water_2_keys_to_beach.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/3168599.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/mebofogebuleziwop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_5fe90a47b9173.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/bazarenazu_rodoberesolor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_5fa93ee697a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_5fb4abb3ad81f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5fa1b3315979e.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/igjecnz/86187417725.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/9395882.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/satuja/tokeniwiguw.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_off0000b452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 5272 bytes
SHA-256: 3fee06a0895b272e9c69ffe23c8f06b59f5105ebf1683913dde96db3a0a8b235
font_01_sfnt_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 9512 bytes
SHA-256: 9ec44b3918cd32434315048acba0af970713973c19a38d07c61caf784aeb16ce

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