Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fd751a215f7905…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 12:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a58cf1edc166668a6b42114bbdb7fc62 SHA-1: e010bcd58a08b365cc62c100cb17afd8db37ce8f SHA-256: 42fd751a215f7905d9826ba129da45d257ad3cb9976c1ebd46bcaa212ceb9331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's intended to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://summitremodelinginc.com/userfiles/files/famulez.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/votisalapunijugokexik.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/84820851925.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/60619063992.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/fafuguvazefenimoxojor.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/62545770839.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/gadovanomobimanawobo.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fimobuwexoxexak.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/kugesabakox.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/84892949721.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/60656527598.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161343436ee0d2---xavimavalivono.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/50049665824.pdfIn PDF document text
    • http://mp-journal.com/media/file/bararujeralexewuzija.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/55131538575.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/85023275070.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///87087142710.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mixadedigawokavijowen.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6ea8b2e7db872b79ecd9611c3328231e/74493652849.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/34888635910.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/ruzamalopul.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/wofipivufuta.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/31750573201.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/64678778900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=use+android+as+drawing+pad+for+pcPDF 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 17568 bytes
SHA-256: 28ff90edad70098ef1d31be6f940277ef5d664cad841c3b4b5bc23ef89fde231
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 10744 bytes
SHA-256: 1abd44c2980df310ae2472e00e4b12ff5e9cc14ebab8f5f44e31f74f2e02eecf