Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82613dde222345d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 00:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abf41ffa291ba20ed0053aacb5ceedaf SHA-1: b7b3266547cca938cf55519168d70afa35f0a005 SHA-256: f82613dde222345d252abbee0d80de07957d8da2ff015aafd194c779296d3faf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, and is structured as a link farm. While no scripts were explicitly extracted, the PDF's nature and the presence of external links suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://doxity.ro/ckfinder/userfiles/files/gadafopogerogexadigadolov.pdf In PDF document text
    • http://bentleyplemtech.ru/userfiles/file/10165186034.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/mupagirigefobaba.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nevafepuli.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qsd28t9d9098glj7p0pnpcd5lh/xutuwanuxaxebu.pdfIn PDF document text
    • https://tsegypt.com/file/7024821931.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/gipulujogubasilumor.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/16198064527.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/713189385.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/nufawojuned.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/xekexofof.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/filumutodomam.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/89796587122.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/10943217567.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/43747483575.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sagawakukukedewuwufeg.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wozivarir.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/93116027941.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/kezaxazomazeruxewewep.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/pivimuz.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/31251417306.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/28494957401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+new+android+os+in+mobilePDF 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_off0000bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 16556 bytes
SHA-256: 11caf918193d56b56e81c08d2e33d5aade4c1e9882a15cb4274a341b499388e7
font_02_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 10628 bytes
SHA-256: 57d6f94afbb172370bc461f376bbf8eed645b52b3a0d31a80c9ceace17bbbed9

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