Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a9c3e374f6b6f5…

MALICIOUS

PDF

115.3 KB Created: 2021-03-12 11:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9d7622e2537986683aa50304a99d5263 SHA-1: e9eea0bac523847b4f4dfb355f1f593f6fd8cb9f SHA-256: e8a9c3e374f6b6f53a47545da793b58ebcc24cd43593734d655e2c61357bf567
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded URLs suggests an attempt to direct users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=ib+biology+textbook+online+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408475/normal_6013e74eb4400.pdfIn PDF document text
    • http://pomirkapa.site/kuzoganigilesujou40y9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5ff31d5f959a2.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/hhi6sO0/smart_goals_definition_nursing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_6049917522441.pdfIn PDF document text
    • http://www19216801.site/esv_bible_translation_reviews355ga.pdfIn PDF document text
    • http://ogranifruit.space/kugagi662l.pdfIn PDF document text
    • http://usacreditscore.info/zivikapiruvumasexaa3olj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_60137c2394e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_600b65066a040.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/higggha/airplane_movie_online_with_subtitles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_602a6ed74a519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_21d871c1ce2a4179846c782365e236df.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_11b33e33ff624a689d7e37e7bb1713ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedesowul/120_volt_ac_to_12v_dc_transformer.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_234b8f10a1d64c50b7804fcffffcbc06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/16227591061.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_deb05139bd624e99a6c629d101e87b09.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BB8 4824 bytes
SHA-256: 8f0a85b105f2a8886a3d2ac6e0bd33a2f65e1a9f1f971884d248c98fd9d9b0d8
font_01_sfnt_off00018c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C39 10868 bytes
SHA-256: cdb62a8f64ca180d07fffed5502dda84c0f4388af062dc322688ad0d22f72577
font_02_sfnt_off0001b15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B15F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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