Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcda3ef99425b46…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c578bb039552c4278829f3b50d1d7fb6 SHA-1: a33eed20e41aa99afdf684911cfe43a816cdec5f SHA-256: 7fcda3ef99425b465ff01642eb08c3202e3d1eab96cfa3d2ec618184836818be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links points to a likely attack pattern involving directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=ocr+to+excel+converter+online PDF link annotation
    • https://hkparkkonutlari.com/image/files/42632870958.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/85096936918.pdfIn PDF document text
    • http://lagrupacio.cat/file/tasisujitilifunijabena.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/33692863285.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/vubokoxaradomadonave.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xerasijofaloje.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/77991276960.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vrackboduqleqhckrogab5vgp3/53953764449.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/vekaku.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/82324936785.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/38981983573.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/061405525718.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/99450787228.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_61B8B7D9657C7943.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/jajelaposazuzena.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/xokuvidajurekemajakolova.pdfIn PDF document text
    • http://juha.be/_files/file/70111814346.pdfIn PDF document text
    • http://exosushi.com/uploads/files/11099397154.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/92677732122.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/696a4e624157c3d81e1bed1c8419a570/godinirusomutidomunoligax.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/39745456488.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/bamiloro.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC4 18064 bytes
SHA-256: 11258e5d1c7e27d45c00ba3b2817e753e215dbef4947740fb332c6a6ab9f7766
font_01_sfnt_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 10084 bytes
SHA-256: 94d6b4a62f76168faada21c35e44facdf43720778ec481f6caa3a04ab93d3569
font_02_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1