Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd432c42ee737dcb…

MALICIOUS

PDF

66.9 KB Created: 2021-01-04 00:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2435f79dbaf1ffb2aae7552fe6294f60 SHA-1: ebe4af287567682488ace960940552ee96cc9b6d SHA-256: bd432c42ee737dcb0594a1e924c8d579b8f1f7251e074b0ab31195b9d6aeb14d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it. The primary URL, 'https://trafficel.ru/aws?utm_term=cambridge+collocation+dictionary+pdf', suggests a lure for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/aws?utm_term=cambridge+collocation+dictionary+pdf PDF link annotation
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/bixedurenozivatutof.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/5cf927.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/O3jfico/ralarofifazut.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/rarorizeradakowipu.pdfIn PDF document text
    • https://momiweporav.weebly.com/uploads/1/3/4/7/134745900/f219a.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/duvotiladopokuto.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/poruvunexiwos_xorufofudazuv.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/f02b459d-8c6c-46a5-b363-e6e8dcbad6e9/galoruti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ef5558-8f0f-4d8d-bb7b-052cced8ad3e/twenty_small_sailboats_to_take_you_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bfa54e-764a-4d57-a5df-ac141d296d90/boxing_robot_toys.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_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 5444 bytes
SHA-256: 6aa98c3d66993ae0a47d347ffe1aa4098bd40d0edabd38687d9c344aecf33560
font_01_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 10440 bytes
SHA-256: e204a44ebed7e3b4f91f6729d8c13fda1fd16589c07b47d321e97a8ee8713ed6

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