Malicious PDF — malware analysis report

Static analysis result for SHA-256 2885e8b26385ab0d…

MALICIOUS

PDF

84.9 KB Created: 2021-03-23 16:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b96b7becf4a83d1945a9a118dbca8a SHA-1: e7b684a691674ef5432f67e802b971d2b8227f03 SHA-256: 2885e8b26385ab0d5ece16a9e7ae0b1ad33e293d56932dad00776d3fc09ca520
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious domains and identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=betrayal+at+house+on+the+hill+errata+pdf
    • http://wagumoba.iblogger.org/atlas_copco_compressor_parts_dealers_in_india.pdf
    • https://cdn.sqhk.co/rogapakaler/hhriaig/solar_system_scope_app_download.pdf
    • https://cdn.sqhk.co/navififoro/jYLhfjg/1868589978.pdf
    • https://cdn.sqhk.co/gobuwovuv/7tTrTy2/9157999336.pdf
    • https://cdn.sqhk.co/jaselavujuwi/dHgdlhf/pepotesuluwegakotijatozuw.pdf
    • https://static.s123-cdn-static.com/uploads/4491155/normal_5ff773c959a3f.pdf
    • https://cdn-cms.f-static.net/uploads/4426267/normal_5fda47cfb8792.pdf
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fdaef87636da.pdf
    • https://cdn.sqhk.co/zimopiroxab/5gihgpk/bearded_dragon_care_book.pdf
    • https://cdn-cms.f-static.net/uploads/4449616/normal_6053602564171.pdf
    • https://cdn.sqhk.co/xafiguzi/jfgjbry/32625610894.pdf
    • http://miwukewemiko.22web.org/46638577078.pdf
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5ffcd59040bb8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gotenukevepunin/first_grade_math_intervention_worksheets.pdf
    • http://fejusudoboriduf.rf.gd/56093609032.pdf
    • https://s3.amazonaws.com/fipijife/99313740000.pdf
    • https://uploads.strikinglycdn.com/files/7c33b683-228b-4820-a410-b55545e01388/hp_printer_5610_ink_cartridges.pdf
    • http://vagaxalelevirot.epizy.com/periodic_table_aqa_a_level.pdf
    • https://s3.amazonaws.com/vatosolikijike/chiyoda_watch_winder_instructions.pdf
    • https://uploads.strikinglycdn.com/files/ba2a0545-b867-4b87-a2d1-8a1afa407066/how_hard_is_it_to_learn_egyptian_arabic.pdf
    • https://uploads.strikinglycdn.com/files/bbba65f5-9c0a-4197-a872-68545da815b7/stopping_by_woods_on_a_snowy_evening_appreciation.pdf
    • http://zafizowi.epizy.com/bepedali.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f472.bin
5686ddc6cf94ddd167ad7f5686c8c04c2f5128469f0763a8f8262a9f7e5d964f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 5164 bytes
font_01_sfnt_off000105f4.bin
b51eac3ccb06b29a138b7e071450561cbf6bfbabb20aa24e55831031163a2860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 2636 bytes
font_02_sfnt_off0001112b.bin
1d2ca450dd5a80f16fa2327289901dda671e72dad64993f142810683345323e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 10488 bytes
font_03_sfnt_off00013533.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 4324 bytes

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