Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7b335b4f3b56a0…

MALICIOUS

PDF

78.2 KB Created: 2021-04-03 12:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c84210b889fb0f1dbcf8ce19773e63a3 SHA-1: cebaa7bd5ac7ba21913cad6ef739f850b2781640 SHA-256: 9e7b335b4f3b56a08f3fd18c0473e2d266ab97586c8860eac9cb5d2700ab02ff
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=beyond+compare+free++with+crack
    • http://djami.ru/emerson_mini_fridge_not_coolinggz54t.pdf
    • http://leomannapov.com/137742585151v7yi.pdf
    • http://wedurorokim.mypressonline.com/gapovidudewedawasekinazo.pdf
    • https://pudakivofuleges.weebly.com/uploads/1/3/4/8/134853743/bawurutegigadu-xatafot.pdf
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdf
    • https://cdn.sqhk.co/petawelesup/hpPb0ij/24295127651.pdf
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/c35d74f970.pdf
    • http://groshyk.site/clip_sheet_traductiontxndq.pdf
    • http://sipataj.sportsontheweb.net/68457112339.pdf
    • https://melajepanaxon.weebly.com/uploads/1/3/5/3/135398769/ce4cc6715b6941.pdf
    • http://wativeb.mypressonline.com/anger_iceberg_activity.pdf
    • http://sugameloxufe.mywebcommunity.org/65719337256.pdf
    • https://cdn.sqhk.co/wepiwojeta/fhh5sN9/dovewemibom.pdf
    • http://jokegave.mywebcommunity.org/8th_grade_math_pre_assessment.pdf
    • http://ledozikatiresev.scienceontheweb.net/wefukuratulejufefo.pdf
    • http://ekzo-fruit.ru/construction_non_conformance_report_samplebhwtg.pdf
    • http://lastmarkt.ru/96395634430nm0y0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://padusij.onlinewebshop.net/credit_risk_analyst_job_description.pdf
    • https://s3.amazonaws.com/kodipopujufipig/11977107649.pdf
    • https://s3.amazonaws.com/bofake/whatsapp_plus_2_abo_sadam.pdf
    • http://nebojemesiwi.atwebpages.com/99519760612.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_off0000ef38.bin
6b58a0d67ae9c7fdb61fbba536123ec91c8ad2a74d6a502228d867fd303bd35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5492 bytes
font_01_sfnt_off000101de.bin
0c911e8c1cddc5e3cca1e31ac9771b556f74e82bd59a4aa32fc95ee7eebc638a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 12260 bytes

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