Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0d2509246e83ac…

MALICIOUS

PDF

80.0 KB Created: 2021-04-10 16:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6460103b1c38ad67066edfdfd71b6ffc SHA-1: f0dd7b3da861428b0d567d46423d98824c33e6c4 SHA-256: ef0d2509246e83acd6e52783c85a7c7c11fb3d3569e28da4ff53ad1f10939f9a
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and utilize UTM parameters, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a legal case, directing users to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=does+jacob+get+convicted+in+defending+jacob PDF link annotation
    • https://cdn.sqhk.co/zowajomi/f5ujgX8/tilimerafatete.pdfIn PDF document text
    • https://cdn.sqhk.co/rakujolo/jOhiMwf/16215251072.pdfIn PDF document text
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/zifikifojexo-bibuzu.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/fefib.pdfIn PDF document text
    • https://tapalezigoluv.weebly.com/uploads/1/3/4/3/134305255/repase_wuborulajelo_tiwasud_gaxudoxug.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/mafanuzevazadomubogifoti.pdfIn PDF document text
    • http://wejafopag.mypressonline.com/76265275876.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/jriiGwO/clash_royale_pc_free_windows_8.pdfIn PDF document text
    • https://nijexenedol.weebly.com/uploads/1/3/0/9/130969845/4a5139146c6a.pdfIn PDF document text
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/javiperusokikan.pdfIn PDF document text
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/9166060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozitoso.atwebpages.com/karerezodateror.pdfIn PDF document text
    • http://kivarutumo.myartsonline.com/machine_learning_the_new_ai_download.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/muxotatamovinapunos.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/tutorial_adobe_photoshop_cc_2020_bahasa_indonesia.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_fbba3621dfce480081d2e8752bbe78ed.pdf?index=trueIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/jamijisegekowedagibedub.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_255bdf834a344156b47732789e74894d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 5336 bytes
SHA-256: c624ac75b6488fdc700aa23c25259a4bbb941cf70b871e471f1c1b2919acc2c1
font_01_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 10892 bytes
SHA-256: fcec2a475fadf4c99e7b2c73783de474387fbc61f37daf04bfd35230c6a6d09e

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