Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caca7af56f55231…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 03:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1545a6077ed2b934a2f3af14a29a2783 SHA-1: 205315f784b7c5abc5a1e20c6d12d333763df652 SHA-256: 8caca7af56f55231d5dd0ad5fe8342e9c23b8d41e07f813147516e394f2e5e54
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=para+que+sirve+un+manual+de+organizacion+de+una+empresa PDF link annotation
    • http://gogosesetuver.22web.org/libro_la_amortajada_gratis.pdfIn PDF document text
    • http://pressit.fun/xewuperudedifipt0es.pdfIn PDF document text
    • http://uplrezina.site/gawetotugeveberemaf0umsu.pdfIn PDF document text
    • http://fakaripeti.xyz/49288226677tux4b.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/adobe_add_on_internet_explorer_download.pdfIn PDF document text
    • http://rezonansmusic.com/nufogukgvh3n.pdfIn PDF document text
    • http://sidikapefujuxe.22web.org/17672728740.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/5268748562.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/is_shade_really_dead_red_queen.pdfIn PDF document text
    • http://zoosalon.org/worikitoliridakixijomamalxaj6r.pdfIn PDF document text
    • http://rameautbxy.space/nelofazo0ruls.pdfIn PDF document text
    • http://usese.xyz/wedding_invitations_design_template_freeu7rei.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/4022256040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezebidurob.epizy.com/amazing_frog__android.pdfIn PDF document text
    • http://panexorumilogim.myartsonline.com/sound_engineering_syllabus.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/naming_acids_and_bases_quiz_answers.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/map_of_pipelines_in_north_dakota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a90813-a8a3-497f-98cf-c444839fec21/97760313250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8f4f2a-6bb2-4665-8750-35e988993673/barobiwixamebotukif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f1d8d4-3120-4ec4-8809-a03d248ce85a/phrasal_verbs_esl_games_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb0cf23-f419-46a1-aaeb-b460c36f70f1/79969412263.pdfIn PDF document text
    • http://buvifaxakekise.rf.gd/brand_guidelines_download.pdfIn PDF document text
    • http://medexode.atwebpages.com/protein_structure_and_function_download.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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5632 bytes
SHA-256: 103b92a690dd65e48069b5de670aa161778bfc6c7aa6ad54544ca311c15e6e6e
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 12692 bytes
SHA-256: 70470194058e95cf515a72fd33964bc408c911a5d08bbc7d8501490afb3c47be

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