Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc06a219d4d0847…

MALICIOUS

PDF

73.9 KB Created: 2020-12-20 20:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c3862adafddc1cc96042d122fd926a65 SHA-1: ebbaee580779167629a2a0cbbc04f72df0d1303b SHA-256: 5bc06a219d4d0847e5caf55cf5c2b0599f207b895347c11de540fff144373c61
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, with one prominent URL pointing to 'traffnew.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates the document's primary purpose is to host a farm of external links, likely to facilitate phishing or distribute further malware. The presence of multiple external URIs suggests an attempt to redirect users to potentially harmful sites.

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://traffnew.ru/strik?utm_term=8+year+wedding+anniversary+gifts PDF link annotation
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/vofurabodibo.pdfIn PDF document text
    • https://ruxibero.weebly.com/uploads/1/3/4/4/134403554/vukesu.pdfIn PDF document text
    • https://govubazidexifa.weebly.com/uploads/1/3/4/3/134342639/139293.pdfIn PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/3650059.pdfIn PDF document text
    • https://lakalenavis.weebly.com/uploads/1/3/4/3/134313358/fa60b5eaaa59a0.pdfIn PDF document text
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/640562.pdfIn PDF document text
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/jobanulofe.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/60313567-7200-4418-86a1-176960157307/66635552880.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/android_auto_update_some_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/parquet_file_format_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b313b7-f3b4-4646-aa5c-b6f0f9dd3873/ginomewofivubewutubalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaec9135-7c94-4a50-baec-8b76fe07cc8f/park_of_monsters_game_levels.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/dabulasitafizulojatotufo.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/8844510352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5efe7f-d915-437d-bef7-04fb7ffdeeac/61455434273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5951904e-4305-40dc-8884-0a1934d72ab1/guxogopigovuxopejok.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_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 5396 bytes
SHA-256: 6d6d6432da5e9f5ebcedc110f19fc50a2896d18fd6990f0671580cfbaa515571
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 11276 bytes
SHA-256: 3e69275da57a4288bdc60530edb1a9277a32dafe400ad9f4e444e217bf794c60

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