Malicious PDF — malware analysis report

Static analysis result for SHA-256 d254c83293277274…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 23:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 09d1e6e622e62dfbf20a8666efee91d3 SHA-1: 8ab89e9308ed51a605192fe25882192d3f94741a SHA-256: d254c83293277274acebbe2df066ce5cb47177b6b2568a19d6517acd7f70344e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The PDF structure and embedded content suggest a phishing or scam attempt, aiming to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://assisdrive.pt/userfiles/file/81778660837.pdf In PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/vununufaz.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/89154806598.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fa7583b1---zuzirafebi.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/jizawifojegagaze.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/kerudexulutemalu.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/bebibamowikusafamofif.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/zumaninitenali.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b4lvo4m8s85irb8n7kg1niiqaq/jipowadep.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/73666038954.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/wokijafulebi.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/gunowu.pdfIn PDF document text
    • https://777mto.com/contents/files/wumomuzoli.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45227348052.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/11371540356.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/saxurimanujerasorik.pdfIn PDF document text
    • http://ecole.ru/text/images/file/37524421890.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/79069877824.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/45086159589.pdfIn PDF document text
    • https://palet-school.com/files/files/sidigewan.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/63412325819.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/68011042702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=multiplayer+crafting+games+androidPDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 15612 bytes
SHA-256: 90bdf71c657ab7c04511cdac484e1c5dd7917bec30b38f410b8cd2e32a7d1cf3
font_01_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 11172 bytes
SHA-256: 32a0089253f9aa5d7d15a6e140f6215be821a5c08ae0c9c01611f3e2f6ff9aa6

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