Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86fa79edf53d580…

MALICIOUS

PDF

72.3 KB Created: 2021-02-03 18:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 07cb98d80dedc60b94cbe69c8ea74a27 SHA-1: d5ea10ec67de3a5432e09cdd4b2e080fc0e0c272 SHA-256: e86fa79edf53d5809770e896ec3fdf78fc221855f4640d7ee5cde74336142d83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing phishing content or malware.

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://maypoin.ru/123?utm_term=osrs+shilo+village+transportation PDF link annotation
    • http://pigovaze.iblogger.org/92187171826.pdfIn PDF document text
    • http://xtrading.buzz/stephen_covey_7_habits_of_highly_eff1pxg0.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/8c9e0184c142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5ff1eb5a68182.pdfIn PDF document text
    • https://fasadosuz.weebly.com/uploads/1/3/4/0/134012998/folof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601885e268436.pdfIn PDF document text
    • http://cg-designer.xyz/birthday_cake_decorations_for_baby_boyi0pz2.pdfIn PDF document text
    • https://wefakibulebu.weebly.com/uploads/1/3/1/4/131408371/sisibivemara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_5fd86a4c4ea52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fcbbf15c231c.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/lulixame_wizasukidix_fopuvejen.pdfIn PDF document text
    • http://repair-telefonov.ru/300_gallon_fish_tank_for_sale_usedv8scp.pdfIn PDF document text
    • http://liketime.fun/sampletank_4_manualahojp.pdfIn PDF document text
    • http://unityfree.xyz/face_changer_camera_apk_downloadj6nfw.pdfIn PDF document text
    • http://all-system7.xyz/829370900121q547.pdfIn PDF document text
    • http://steel-lipetsk.ru/24424885528djsyt.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/peveziwoguxuzam/free_audio_reader_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/certified_scrum_master_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/ranesepazadilupiwuwuvi.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_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 5168 bytes
SHA-256: 9484af92078c074a07ad1fe2007c560e3d077d95b0c51ed8fc7a1b2a50c49d5c
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 11276 bytes
SHA-256: a0be88f1f6c3c5f1ddf3ed8de513312a7551b1c19bae528d4353c7967e69bdfa

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