Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea4ba38be0b58d5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 18:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b2d0816f7f45a549eb63393ba2d1e1d6 SHA-1: 7a8fc50d1bc33b06e2f425bc7700356354d66d30 SHA-256: 3ea4ba38be0b58d592b765bacd67b4030f9f6af24b60868d5570410c1f686e53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://akkoryazilim.com/userfiles/file/nivigaxuverajoxujosino.pdf In PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/48982889451.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_035330.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/romalavuriw.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kejusufap.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/zujozizifig.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/fabaduwekopovuxi.pdfIn PDF document text
    • http://sdds.be/userfiles/file/33578278727.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/93402549533.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/lazovesiz.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/jevexemebal.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/43827291791.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/zukebixagusumagazojavusev.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/9067273528.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/duxepifulafasa.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/8673370678.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/kotabavagopidisedizuwedo.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/63049127043.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/88434356163.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/menus.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/tiwilisiteramawuraw.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/76047133177.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/28527101350.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/zinolas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pel+led+price+in+pakistan+2020PDF link annotation
    • 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_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 17636 bytes
SHA-256: ba71dc136e07ff66ad73b31aa5985f9fe8a245d832a5fed929103a00a07502cb
font_02_sfnt_off00013517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13517 10720 bytes
SHA-256: f36dcdbc45d2b7ea03322ee95c0e4b9dcfca6c6ddb4bc878d335aa8221167bb0