Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d1c701aa3d4ea…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 19:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8137c532044f8a07d004bd85a15976d SHA-1: 3d3f10dcd7e0575fd028f94443b8d03d9428e6a5 SHA-256: f40d1c701aa3d4eac2284e0a0afaad2193701b5469fdbec57a329ea90e2a775f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting, and ML/ClamAV classifiers strongly flag it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an intent to redirect users to malicious sites.

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 https://synerhu.ru/uplcv?utm_term=assistive+touch+for+android PDF link annotation
    • http://edeins.com/userfiles/file/10772393141.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/fuxuxowijepakorofod.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/78249915019.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906100744.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/79071625237.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gagunonegazux.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/70021045990.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/juvax.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/35908244141.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/59898842651.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/54410232063.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613194ebdbda6---jipogigawamebidel.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/tafotemepuzu.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/bajileledejeremetedatawe.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/34709560131.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmd8fp13b6r1fhf4jgeut70tuo/76724965095.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/jejusojepekuruwobok.pdfIn PDF document text
    • https://armenia4d.com/contents/files/70513469287.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/wowof.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/16071797877.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/83258228368.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/82549853446.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/93278021199.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109030843224999.pdfIn PDF document text
    • 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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 18148 bytes
SHA-256: ad5b0ab58f0782f957cf3d860030c0d5e67aa8045214853e119374414a1c21e5
font_01_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 10672 bytes
SHA-256: 29599d0e8d8c3888b565d6c7493431537824a70cac300617ea57fcac986fabbf
font_02_sfnt_off00013274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1