Malicious PDF — malware analysis report

Static analysis result for SHA-256 306c08e872a83b51…

MALICIOUS

PDF

65.7 KB Created: 2020-12-24 22:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 68192761ee1e904eec16fbcd7e7d0d90 SHA-1: 782713db7eda681c98760dba6a8fb0aea41c7d51 SHA-256: 306c08e872a83b5179f0aa48bdd8270bc40ca8ec1062561f8839bb0c19e1c73f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure for free downloads, likely to redirect users to phishing sites or download further malware. The presence of external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful content.

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://trafffe.ru/strik?utm_term=anime+naruto+wallpaper+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5fa64db7dd621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd6745741839.pdfIn PDF document text
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/3629743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5fcff458cfffc.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/8709568.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_5f9fa4d195709.pdfIn PDF document text
    • https://zozufawagizawag.weebly.com/uploads/1/3/4/4/134454621/xesoke_didukiwo_kazijunekiguzib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fa24a7cd54d8.pdfIn PDF document text
    • https://pizolixes.weebly.com/uploads/1/3/4/8/134874149/6749300.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/c140cd45-6401-44bd-9c94-6a2b56f05678/21447199594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf109874-aa8b-43d3-90f4-d0460a44a1f6/rikozowogajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b207d60-0994-451c-838d-926aba43cf72/issaquah_school_district_calendar_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5c7c03-02cd-4282-8bae-d9c4e6473eb6/kaxota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f632e606-16bd-4b65-85cd-042cf7805407/derosibolut.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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 5092 bytes
SHA-256: 1104c41065c881aca7dd08f95bb0397f960d25565fafe7cb33faf298ab5147df
font_01_sfnt_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 10592 bytes
SHA-256: 076a3785c5fde8d8eeaf7d8ab50df35613af2fe817ce91e212aa68cab380cdd4

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