Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44c7d2a8a12f4d9…

MALICIOUS

PDF

58.6 KB Created: 2020-12-23 17:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: caebfcb50e00a7542c16537283ceea8a SHA-1: 1b984b4277a082286451ecb109e1841dc4389eb1 SHA-256: a44c7d2a8a12f4d9d548cbe8f11c4cc236a74a60b7afea18995ebed55de63ef3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically identifies this behavior. One of the embedded URLs, 'https://trafficel.ru/strik?utm_term=swatch+watch+80s+protector', and another linked PDF, 'https://penepanixefi.weebly.com/uploads/1/3/4/3/134354239/kigewaxa.pdf', are flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=swatch+watch+80s+protector PDF link annotation
    • https://penepanixefi.weebly.com/uploads/1/3/4/3/134354239/kigewaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/AgghiNl/wefubisuviviroter.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/REkdWM9/teachers_assistant_certification.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/90db3d44-4a7b-4972-a431-edd4387f3e78/rules_for_assigning_oxidation_numbers_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/bizetumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a8d45c-bff3-4901-ac82-602195b96ada/75344445841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d63234-2730-4339-9699-31504cf20978/hamilton_beach_ice_cream_maker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1fc1c5-4806-4cd9-ae1c-15d72c1d2b7a/7508371707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b8996e-5b47-4d11-8382-ec3a01a3a95a/zona_de_desarrollo_proximo_vygotsky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed53030-aa77-4dc7-a1f0-53221823a4ee/sq_ft_gardening_planting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c63dc7-2d26-40c4-b0d4-eb7a1f072722/32120260096.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_off0000aca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA0 5520 bytes
SHA-256: cb8fbf73ab587674879516fe10209bc2a220421499fc167e9cdcbcaca2581243
font_01_sfnt_off0000bf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6D 8936 bytes
SHA-256: 1455fd32596251a3babad91409e036722bd3c4e69eb3e11b88599290dd75c632

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