Malicious PDF — malware analysis report

Static analysis result for SHA-256 d988992f82708e33…

MALICIOUS

PDF

60.9 KB Created: 2020-12-23 19:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3e72673d498be6234b8a2f4ad7858a4b SHA-1: 91520060de000fda322193993654b586632a9667 SHA-256: d988992f82708e33a610cc31a38c13c6ee4cea4515911fb948abb483bbd98e78
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an effort to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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 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://trafftec.ru/aws?utm_term=anchor+hillsong+chords+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416671/normal_5fa5ad016adc0.pdfIn PDF document text
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/b02e4f.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/CuAphdy/46089889596.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/xofutofusiboge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fdda7b3aaa6e.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/4744084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5f9fbcf230eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd0efdabf082.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/iiBicap/cover_orange_gameplay.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/7499627.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/5a699651-f62d-4c57-91ba-d5c264a2bb48/17479243352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5783d709-22eb-4d51-97e0-964172e884dd/kawanimovemazumowibepekur.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/a_level_biology_revision_guide_edexcel.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/fukota.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_off0000b3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BC 5196 bytes
SHA-256: a707dc5804e5dc47121f27897ed99e4645a7a45696b20df85dfca840f3a34d79
font_01_sfnt_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 9792 bytes
SHA-256: d04335d8c3b5bf95f67b2d6126e8fbb74f99292688922ad19583e622eab8b25a

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