Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a45d252cd486db8…

MALICIOUS

PDF

110.0 KB Created: 2021-05-08 10:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f7c64669cc809adc2f411e6fd8b97b98 SHA-1: b3298126875099e76740a7a3d36eed10ef333782 SHA-256: 6a45d252cd486db8bdebab2b267b48d72993ca9d2b22397b963b8130ed693fb3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=corporate+finance+equations+cheat+sheet PDF link annotation
    • https://juvipafas.weebly.com/uploads/1/3/4/5/134583250/juzakefenud_vizovadivala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fcbcb9ac1a72.pdfIn PDF document text
    • http://tinosexepupab.iblogger.org/math_worksheets_for_class_1.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/gfkieVj/good_company_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fff051135e02.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/D9jgdid/3649481478.pdfIn PDF document text
    • https://cdn.sqhk.co/kusasuzona/gcgdhiP/text_twist_2_free_online_games.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/d901cc3.pdfIn PDF document text
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/8795842.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/jjoiP8W/23151763730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_6002137b14873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fc8732cc992e.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/ggfmggl/judijuwaxibigikulimuposu.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/yjd8Xic/sogixusidig.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/2eea28c8f0c6fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_60451e86a90ca.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/3868046.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/j11vnbE/grandparents_in_spanish_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/Kltjfhd/prison_escape_movies_on_netflix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d319b308-fe8a-482a-a07c-6e8ea8764cbb/jisifexadorofogezivep.pdfIn PDF document text
    • http://roxojibato.rf.gd/71857078571.pdfIn PDF document text
    • http://luxixeg.epizy.com/bookkeeping_and_accounting_crash_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc8281d-f76c-4551-80a1-47690417a544/bobalufetezojesenem.pdfIn PDF document text
    • http://gufolisalowu.rf.gd/81170975171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13c3764-afa1-415a-9d75-0562755cf0d9/white_rodgers_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11233edd-2e59-467d-abb9-caeb0f26396d/kegewowurilidabizuromenab.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/arcgis_10._4_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89cbe5e-a316-47d6-be19-9a87fc6d7a18/how_to_reset_a_samsung_nexus_tablet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7D 3688 bytes
SHA-256: da37ea3c8ceab489e3b8743f3ae12d38bc0786fd555b19ac7ff1be79e2ce7a04
font_01_sfnt_off00014ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB3 5100 bytes
SHA-256: 03b4d6d9ca6d66698b242eb51f6a26479c21f1e84b6fdfaf788a3fceacce98c4
font_02_sfnt_off00015c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0A 16544 bytes
SHA-256: c47ff58085e628ea23ddf76cb78dca6088c3e540074d36a737d7dedd93244774
font_03_sfnt_off00019136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19136 16952 bytes
SHA-256: b56373b3279be510c992398801dcfdea9dcd5cc13a208fa965a4be7e980acff5