Malicious PDF — malware analysis report

Static analysis result for SHA-256 509da781ed624032…

MALICIOUS

PDF

96.0 KB Created: 2020-12-08 03:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 48dedb48dfae639f5fc518060c473384 SHA-1: 7320d2be79ffebfd20404ded24d23a6feca3b3c1 SHA-256: 509da781ed624032e528e9b36b876615d2a697b1340efe35fa089737a56fd01a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://trafffi.ru/123?utm_term=9%25C3%259719mm+parabellum+cartridge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fbf2ce2ab9ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fce07b23e562.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/nogeguras-nabefapu-badise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f923194d4dcf.pdfIn PDF document text
    • https://pomawuro.weebly.com/uploads/1/3/4/3/134368023/bb9637a40.pdfIn PDF document text
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/sositukezeku-nosozimoki-puvaduralidajok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8e507ca98a3.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/617d2e8ce.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/vososasoxumete/22603707111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b7b7073-8328-4e27-bf81-9444a583019e/74088986825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39b1b35-94c2-4790-9f47-ca3426f9b055/81945841256.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 5540 bytes
SHA-256: 1909ce11da16535219927b35333968fc35626dd3812f55b2f1aa4ffea8ddf0d6
font_01_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 3020 bytes
SHA-256: 0b0a9b1da946ac1b4a5e14c4452e6d1573f54a64c707411c8202e068d3ca25ee
font_02_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 12244 bytes
SHA-256: 80e34648803d61340cc873cb1205ebb1be98424dfaffc640be04a41c2a53043e
font_03_sfnt_off00015b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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