Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea8cc3630a5c3a7…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 21:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6b9e371d0d3c1dfe939231b0ba60558 SHA-1: 8d927bc127ebe1b177634a8abbfdd98ead204ee8 SHA-256: 3ea8cc3630a5c3a7885de7231ccd910b0ae998bce61ed01b377e563b2be50cb2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with a high-severity heuristic indicating a remote-support tool lure. The document's structure and embedded URLs suggest it is designed to trick users into downloading and executing further malicious content, potentially leading to system compromise. No scripts were extracted, but the overall pattern points to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://seamacros.com/upload/file/wajupimaruruzizuwojigoguk.pdf In PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/kabireser.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406fd58f554---32650874740.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/64142645137.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/56156475944.pdfIn PDF document text
    • http://cl-pub.com/files/files/xatubun.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/68372629825.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/wuzejumazixe.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/jezobejizodape.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/69402492603.pdfIn PDF document text
    • http://jawarakreasi.com/file/77632528164.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/lajabeniji.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/73853440895.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/37589785760.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/bemosejamuwumexewari.pdfIn PDF document text
    • http://yuli-china.ru/d/files/lopivir.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/21854006551.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/87731188790.pdfIn PDF document text
    • http://sbcnepal.com/images/file/43072806255.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a080c224bbbdd22f3b3403481bb82b6d/75077038597.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/78165910272.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/sukivavujokugosuko.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/bewemamufanigebived.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+remote+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_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 18012 bytes
SHA-256: 069cc85ee10e2b31696b1bb71693b2fb64c4ec1fb59f3f9aa8b5e98556a1fb61
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 10176 bytes
SHA-256: e51eb4aacfa3a6e037b181b8e03650927266ca05ef8a6d8b6b008601366b908b

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