Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09c58fca2215ebf…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 06:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d2771069620883139bc56c996cacd11 SHA-1: c1bcd042c4fceec544bf18c5291ba3b39123a545 SHA-256: b09c58fca2215ebf6a699f7d240a5200890a3b60816cc633ed33a82f82ec45ad
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URIs were extracted, pointing to potentially malicious websites. The presence of embedded links suggests an attempt to redirect users to phishing or malware-hosting sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=watch+any+movie+apk PDF link annotation
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74557430907.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/41998339542.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c9055a4c---wudawulaxomigonepowu.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/85117863173.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/23478773602.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/weliputesapadeguvezixune.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/nozisusubavosix.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/xemoveno.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/21994552725.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/97754594524.pdfIn PDF document text
    • https://dintek.eu/uploads/file/fudapipivi.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630552432.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/jigij.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109102335078563.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/62426108123.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/netepakixipelu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109180551485353.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/40406820636.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/wirazodikodimuwimowiwir.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/xonoxubol.pdfIn PDF document text
    • http://aweibel.com/Photo/file/poxarubetagitid.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/tadisone.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613cf5af45bd8.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/44j1ijg95g4hd9cignuhle465s/xonefure.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_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 17520 bytes
SHA-256: 41fdaf54348091ec5fff28a93272652083817f6a6669cd6eb8d50abcc5a89bce
font_01_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 10592 bytes
SHA-256: 48612f59518fe074b401a0fe2415df321bff64b8fc583d4157103ecd2ca8a842
font_02_sfnt_off000139bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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