Malicious PDF — malware analysis report

Static analysis result for SHA-256 934a43d4b534f073…

MALICIOUS

PDF

95.1 KB Created: 2021-10-08 04:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 25919f1b9bbeb81572e51be17f36980d SHA-1: 54dd2e2ebea5cf07321cf7ab1042b72ceedfbc7a SHA-256: 934a43d4b534f073d7b4c25692bee74f5821710787daa70aabfa08360331b07a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/88616038377.pdf In PDF document text
    • http://yonetim.e-cari.com/upload/files/93664327063.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/pizud.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xivosabetawabar.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202110062024065253.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/45470799469.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/86550389070.pdfIn PDF document text
    • http://unsersohn.com/images/file/79028919445.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564e53be192---66833590065.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/nevuvikagusu.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/92144426727.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/97823156155.pdfIn PDF document text
    • http://nessium.net/userfiles/file/topasonazigotoput.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/mowiriverenonu.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xexinomesasabuwino.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/voremedowekuza.pdfIn PDF document text
    • http://sivam.pl/files/file/83012504346.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/34156959954.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16156435d224b2---38681063740.pdfIn PDF document text
    • http://strandkrabbe-hohenfelde.de/sites/default/files/files/63540186197.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/xedobimevavasipugiterifat.pdfIn PDF document text
    • http://xlith.com/userfiles/files/pafexuzubu.pdfIn PDF document text
    • http://parateam.cz/file/94934582530.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/21686114067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+makes+life+worth+living+philosophyPDF 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_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 20344 bytes
SHA-256: acaa9c7270592917216efb6a1ce15d4e8d06ae875488c37dc63be32cb79007bd
font_02_sfnt_off000154b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B3 11156 bytes
SHA-256: fc79e5a2fb013e19290039d0204e56460974345096b91f478e3ed4c2690fd794

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