Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b2e045cdf22629…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 11:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d92b551a5a931ac6f08551d6e786e062 SHA-1: 77604221054cbd788a9e469393a8fb865eaaf6b4 SHA-256: 64b2e045cdf22629ddf0b1baea336663925ded09ea16deb229dc0c7f7be402c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various PDF files hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cokhiminhhien.com/media/ftp/file/gugokurodojejonafuxebi.pdf
    • http://shepardinteriordesign.com/rw/upload/file/xisaxewenodumavesaxu.pdf
    • http://pensionpoint.cz/userfiles/files/79088201733.pdf
    • http://rasmesafar.net/basefile/basefiles/xozubu.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/2109101304522201760wirx.pdf
    • https://tattica.byespresso.com/app/webroot/files/upload/files/15504304921.pdf
    • http://cokhitienvuong.com/uploads/files/kikapozivijezo.pdf
    • http://esebtekstil.com/resimler/files/83877666964.pdf
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/benubidat.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/6742891068.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/59324639289.pdf
    • http://simkoongschool.com/uploads/editer/files/rojorefetamaranotukuve.pdf
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/33205809025.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906044336409220.pdf
    • http://thepokeluau.com/uploads/files/nadob.pdf
    • http://www.ezmoving.com/file/buwusosameluburaworuwa.pdf
    • http://scamps.biz/userfiles/file/72465363828.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6abb02ac---vaxasute.pdf
    • http://nwatchonline.net/userfiles/file/60732221472.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/mevovomivefuvimejuli.pdf
    • https://momentous-inst.com/uploads/image/files/dedatitijufuzufobodeleg.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7d18744d87946c44aa3ceedc8d7865ac/fekebubom.pdf
    • http://ph-easycome.com/userfiles/file/pedonozomap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+get+mirroring+on+my+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 16792 bytes
font_01_sfnt_off0000e7b9.bin
99dc209f1f0568e8f6dd8ac19bc350834754faec495ef9b56e9eb4a47e76d845		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 10656 bytes
font_02_sfnt_off0000ffa6.bin
91f6d6195adf97915a7d23c33d80d549ddc5835fc04af8fe20e8b595e4763670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 17800 bytes

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