Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4996a4fc7e5664…

MALICIOUS

PDF

69.0 KB Created: 2021-09-10 14:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80f3e105895b84c1b654291f0cb04c4b SHA-1: 395eb63456aee186031909fd232af949c5682de6 SHA-256: aa4996a4fc7e566401c29b0205fd9658f14a5333c62ce347dc2d237f088ba394
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious content, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external sites, likely for phishing or to download further 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://fishboat.hr/files/jowubolewomekodugiripipi.pdf In PDF document text
    • http://studionegro.net/userfiles/files/97120027219.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c7723c0f---vupijupirofizekeku.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/66940177109.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/93604112355.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/81112259444.pdfIn PDF document text
    • https://ijp2.com/contents/files/78582695079.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109041116052684.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/nikusamosibavovenuxuxif.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/1992435631.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/pubiwab.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///gemepunotodesaraw.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/guvakabobod.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/mitir.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/bokem.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/22039467242.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/70140034156.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/jifekegufe.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bideperaxikag.pdfIn PDF document text
    • http://parateam.cz/file/26399720753.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210907040214947.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xusuvakanumowewirobeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=breath+tim+winton+pdfPDF 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_off0000af15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 15492 bytes
SHA-256: e544d55be9c28e7134754581e7af7670b92d382d907d2e36a0c435793e095362
font_02_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 10688 bytes
SHA-256: 64b731b1eaa9782199c63920beb59b027e90257f935ad7b97d2ebe5ad9d0331a

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