Malicious PDF — malware analysis report

Static analysis result for SHA-256 caba59196db2631b…

MALICIOUS

PDF

69.2 KB Created: 2021-02-04 07:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2c23a01c0d2f784be650b052d4b72084 SHA-1: 0be1b8ee7d9f501c66ce96cf6e75c652d0c92b10 SHA-256: caba59196db2631b41045cfd48f4fa6afb2b28470c592a23f87b1fb8bae48fd9
156 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. The heuristic firings reveal it contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially malicious websites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/aws?utm_term=clever+answers+to+what+makes+you+unique PDF link annotation
    • https://cdn.sqhk.co/nupasoxure/XXGrgdu/roblox_zombie_games_2020.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/budidi_zavero_joxugu.pdfIn PDF document text
    • http://futubog.22web.org/8086_addressing_modes.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/cIifnQk/witizoxelefir.pdfIn PDF document text
    • https://cdn.sqhk.co/juzivadareka/bQhcidQ/randal_s_monday_sequel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fe90f735092f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fcbc3391215c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601a5d6384ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_60198fc49ce11.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/4478384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375203/normal_5ff5c976accb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5fdf29e9536bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5fdda2a4bceea.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/jegafilagemeda_dumuzegamogitaw_puduzule.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_off0000d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A2 5276 bytes
SHA-256: 3d53ebdd97a07eee2d20e93de672b8d726dacac53304336ea95ae71989715bbd
font_01_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 10432 bytes
SHA-256: e37ff957ceedb6c073f6077dca46f4747bd69d11c00ec38bdd8647137d17b19f

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