Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d79ab01a4b2af93…

MALICIOUS

PDF

62.2 KB Created: 2020-12-30 10:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 06b395385699a9277e8ae8deff14bf16 SHA-1: b8bb613a4949a2b75faa9ba8fb61783fc247714d SHA-256: 9d79ab01a4b2af93215da05c3010bccc588a23127cedddd33be21f5e4474adb0
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which are disposable or associated with malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing. The embedded links are the primary indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/123?utm_term=drum+rudiments+poster+pdf In PDF document text
    • https://cdn.sqhk.co/wejupexuput/gehjjeo/battle_warship_naval_empire_mod_apk_latest_version.pdfIn PDF document text
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/bipirono.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/xovefirebe-dikuxepixazo-lovojulobena-perugusopi.pdfIn PDF document text
    • https://zatajiwivovib.weebly.com/uploads/1/3/4/5/134529671/gawuvujanikal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5fcabbe2e2af4.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/1859814.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/mutusuro.pdfIn PDF document text
    • https://xetebozeb.weebly.com/uploads/1/3/1/8/131872130/2078168.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/vubekunibakivonoze.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/a6a7509.pdfIn PDF document text
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/9391471.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/01d1e72b-053c-412b-8559-0e6fdec0ac3f/reanimated_corpse_in_7_days_to_die.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd8017f-4688-4629-a336-f8b175d107f2/ensayos_de_arquitectura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7c74e1-7395-477c-a16f-c0804a40fb11/skyrim_command_speed_up_time.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_off0000b948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB948 4944 bytes
SHA-256: 5e90e518e998d0bf3b05a418a802d7ec69755508c76141d0fc66dc6af40cfdcd
font_01_sfnt_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 9988 bytes
SHA-256: 2f45fd438e92563149be64bffde2efeee51eb56d43442d6a3aba6b75b232cd65

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