Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9545b674dab2301…

MALICIOUS

PDF

74.9 KB Created: 2021-04-10 21:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a352b7b00e664625616a3f7bfe7e11 SHA-1: d91f98274c81d7df8371b5e1b41296522aae0426 SHA-256: c9545b674dab2301c3570c53145260aa40252d36271eb1996e01cb8e7ab1ba13
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely 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 0.9993

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://zajinet.ru/strik?utm_term=forged+in+fire+knives+walmart+canada
    • http://limaxinsto.xyz/445274855178mtww.pdf
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/5464a7.pdf
    • https://cdn.sqhk.co/senuziker/bhgBUpq/tiruzazivezozonimukek.pdf
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/a1caed.pdf
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/c2e6c1a548.pdf
    • http://rixanemusijod.mywebcommunity.org/biosensors_and_bioelectronics_book.pdf
    • https://cdn.sqhk.co/wenejusuzixe/gfOh92C/graphic_design_definition_in_art.pdf
    • https://cdn.sqhk.co/gasowifozil/Mjfhjkj/colchester_county_high_school_sixth_form.pdf
    • https://tafopolen.weebly.com/uploads/1/3/4/3/134396822/doxafufalid.pdf
    • http://olx-delivery.cc/sefasetudmmbea.pdf
    • http://scandisvet.ru/repuramamuvilefinakapijdfq8.pdf
    • http://alsamcctv.com/jorufijoronaxiwemobaxolpgzj7.pdf
    • http://seweripuwas.mywebcommunity.org/23154012930.pdf
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/bifizevezalo.pdf
    • https://cdn.sqhk.co/ranotigu/jjgcpZj/scoop_it_up_minute_to_win_it_instructions.pdf
    • http://lbaranaydin.com/rajasthan_patrika_sikar_epaper_today_downloadh0czo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zifejurujudeku.epizy.com/dokafineletit.pdf
    • http://kezijewuzal.epizy.com/gopuvumadumuwidop.pdf
    • http://nolugaluxexinag.rf.gd/caster_wheel_dimensions.pdf
    • https://s3.amazonaws.com/jevedijadiki/bird-_foot_delta_is_best_formed_by.pdf
    • https://s3.amazonaws.com/vapite/93012935678.pdf
    • https://s3.amazonaws.com/wukevirenesu/36820407238.pdf
    • https://s3.amazonaws.com/tokatefozude/xubiwavibej.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7dc.bin
6b119dff9f687a72289d491c02a5742a28281fb409582d97c9d9fc3e30441fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 5512 bytes
font_01_sfnt_off0000faad.bin
8c9e392b57ca1bf126524d16cf9f5d4a5c78546470b027807e4df4db2baa31b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10508 bytes

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