Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d12aab2877bc85b…

MALICIOUS

PDF

83.8 KB Created: 2021-05-03 10:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e88998b41a1fe9fba7dc8b316e2caa3f SHA-1: 40d3768d09a7cd3fa3140fdb0ef58c9410e92288 SHA-256: 0d12aab2877bc85b71010bd4de9fa56e083c579d78284ffc0054edcd274f6636
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the external links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=how+to+make+master+cleanse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411250/normal_60535e2241192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_5fe7d7f2a7097.pdfIn PDF document text
    • https://cdn.sqhk.co/lukejisuvawe/3FqAcib/tunnel_town_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/ZtiehbR/dune_cat_go_kart_parts.pdfIn PDF document text
    • http://gifebadop.iblogger.org/18127078238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_605a51614fd8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480598/normal_6004e9a4a4c1c.pdfIn PDF document text
    • http://xanevejesofag.mygamesonline.org/87892400627.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/jjb1iiv/all_slime_simulator_codes.pdfIn PDF document text
    • http://gojoges.iblogger.org/kure_beach_pier_fishing_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_603791164f047.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/821f67cc-5211-46b7-a2db-c2effa039890/98016357981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d7456c-579d-4ff7-9f3e-79ee373780ef/tekisewiderozuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a28cb5c-4e64-468c-aaa7-923c207d0a9e/98448108508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0091c80-0d95-47fd-8c22-0ec45bc9f0b1/pupazupuxaxezonumenubuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52675442-d607-4b53-ab37-d50c293b03bb/pencil_drawing_classes_for_adults_near_me.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/saturated_steam_vs_superheated_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f2cc5f-4d1a-404b-a438-0cbd0ce4bf43/12093288434.pdfIn PDF document text
    • http://lisokabosexipep.epizy.com/nisupes.pdfIn PDF document text
    • http://wifovofor.epizy.com/angular_6_documentation_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47bcf4a-3bab-4d5e-8e68-d8f3ef6cd45b/ludatamidoxagiwo.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/gastrointestinal_tract_diseases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a25648-36d7-408f-ab09-980a0ed6e872/58638189360.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 5064 bytes
SHA-256: 6fcef8b7af09fca74c0e1766c8e4c40375ebcd211a5c980df5a4009ffe6b7e65
font_01_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 11304 bytes
SHA-256: 3c73f9dfcb082e144a01c4b919bfa33e9cf367d01e529289fd6c7ba2c67b8c5b