Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d43bedeafafef8f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-13 09:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 457134f27c12a9a2751d2739b1dc8467 SHA-1: d7fd9edf1d15b7e6a00f8eadd728db75f338f708 SHA-256: 9d43bedeafafef8ff66eb0379f2339a59a0352db99516cca26f649b93eeaac27
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 likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains a search query related to medication, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=what+medication+is+used+for+coronary+heart+disease
    • http://lnstagram-copyright-confirms.com/osha_forklift_daily_checklistwdzfd.pdf
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5fd8381a1511c.pdf
    • http://torixobo.mypressonline.com/isometric_view_in_engineering_drawing.pdf
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4403560/normal_5feef2c0c586f.pdf
    • http://hugertely.xyz/zusetoevz3i.pdf
    • http://sovuradema.medianewsonline.com/dicionrio_de_aramaico.pdf
    • http://5-euro.info/sesopusimapegubuwifuleaybu7.pdf
    • http://kafalukuwemi.mygamesonline.org/bardavon_health_innovations.pdf
    • http://electorat.org/pioneer_avh-x4700bs_price7lgcu.pdf
    • https://cdn-cms.f-static.net/uploads/4427086/normal_603cbd0ccb95b.pdf
    • https://cdn-cms.f-static.net/uploads/4393890/normal_605c27d7d9053.pdf
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5fdd7c18b6e5c.pdf
    • http://openplafond.xyz/vubivakuwonuxenibipewank8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dalava/what_is_accrued_wages_on_balance_sheet.pdf
    • https://s3.amazonaws.com/sisaxu/homelite_2200_psi_pressure_washer_price.pdf
    • http://zibelasavu.atwebpages.com/explorations_conducting_empirical_research.pdf
    • https://s3.amazonaws.com/jigezilor/paxazejuda.pdf
    • https://uploads.strikinglycdn.com/files/11346eea-483b-408a-8a93-2be047314bb5/gaxikemevejipixurasiji.pdf
    • https://s3.amazonaws.com/julaxel/56575477411.pdf
    • https://uploads.strikinglycdn.com/files/74bbded2-6d02-406f-8ba6-c2585534245a/ludamuzarexuni.pdf
    • https://s3.amazonaws.com/dupula/auma_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/b91d1e45-ac62-4a0a-a409-f51d88c6ec72/26179158436.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_off0000eb88.bin
96c561a119079be9c02f31e0af40caabb95544da986933b22ac777bf98621145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 5344 bytes
font_01_sfnt_off0000fd9b.bin
f3c99bec2a838c3fb7440426e5c8862071019472818c1fe6ec80c595a1edf434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 10600 bytes

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