Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4397d0d69b8fb31…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 13:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b045a9eb3f941c3d97033532bf4a2224 SHA-1: 5c3f2276c2273d55ecc488d848428bbaa441302e SHA-256: b4397d0d69b8fb31569bed0a43af3af4779566a34de7d0e2703caed64e714683
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

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://baarspo.ru/123?utm_term=boomerang+mughaiyazhi+video+song PDF link annotation
    • http://puzexijabin.mypressonline.com/wufivetiwisawiko.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/hjjchhl/pogugi.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/past_participle_bingo_esl.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/gfgijc4/nofigomubasepo.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/amar_ujala_agra_download.pdfIn PDF document text
    • https://cdn.sqhk.co/renonidofel/piijfmE/xodedubunusasovuw.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/j8ZAvjf/lyft_driver_california.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/ehi3GCl/application_giant_ride_control_app_bedienungsanleitung_deutsch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/48364374418.pdfIn PDF document text
    • http://bopamebedozupux.epizy.com/835201292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b84847f-d91a-432c-9050-1a82df299564/best_emergency_food_supply_for_families.pdfIn PDF document text
    • http://fasevebozumip.rf.gd/zuleloradupukuwikapu.pdfIn PDF document text
    • http://podadoperis.rf.gd/zalirilisur.pdfIn PDF document text
    • http://kotidaw.epizy.com/bulimibuzezagisit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f74051-3476-47b7-8fe7-4e0feb5e7a2e/how_to_write_a_statement_under_penalty_of_perjury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27a1e93-4c1d-4470-97d7-8f91d3a590e8/636145200.pdfIn PDF document text
    • http://jovesiresumu.rf.gd/89746513403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e295d478-5b31-4795-b4dd-22973bc51cbf/71337539180.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/wekedukupogujote.pdfIn PDF document text
    • http://raronamivado.epizy.com/84203419690.pdfIn PDF document text
    • http://kozitoxezafovi.rf.gd/akashic_records_english.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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5468 bytes
SHA-256: 06ba49d1b62d6945bfd14e17311284023d3f46c7c50d13e6c5edd681484a7123
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 11716 bytes
SHA-256: cea3e2840e27a4011bb50ef63b6cfcfbd4344c6361b0f8733c2cb2de1c72441a

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