Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3f521837bd2d91…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 15:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b9474f1f9aaea2f0a6f219a38208b5a SHA-1: d7b40b46a5c164b7f12a2e8fce44d96eb124045c SHA-256: 5f3f521837bd2d9180b2c20022f6405d76d47d8f8771326ba96702de01993786
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. This suggests the primary intent is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://efckrakow.pl/userfiles/file/30124493253.pdf
    • https://ginniglobal.com/uploads/file/28657712288.pdf
    • http://vit-physio.de/file/73871476026.pdf
    • http://vinhthuan.vn/upload/files/wifajajizabugizuzarolonon.pdf
    • http://ntvietnga.com/upload/files/nedekiviwijoziwija.pdf
    • https://telorgabus.com/contents/files/49994536673.pdf
    • http://pitchdecor-construction.com/user_img/files/samadewifopiperefobabavas.pdf
    • http://domingo.hu/ckfinder/userfiles/files/vuxapozididixut.pdf
    • http://cityclick.it/userfiles/files/zogenotifapaxavo.pdf
    • http://thuduchouse.vn/pics/file/77445811528.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/muxedezin.pdf
    • http://vps73.juicy-group.com/editor_upload_image/file/memujipawom.pdf
    • http://anipetkingdom.com/webroot/img/files/dujafipimijufil.pdf
    • http://pi-consulting.ch/download/53724465010.pdf
    • http://xaydungphongphu.com/uploads/files/bodazimebi.pdf
    • http://paulgraphics.paulsfashion.in/files/tiluxozuf.pdf
    • http://www.hgbehringer.de/img/files/files/xedarumuwu.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/vobezoriwiwidewuxes.pdf
    • https://officialbacknumber.org/editor_up/48600770991.pdf
    • https://dailyiat.com/html_upload/file/pewaxumeritazipegegi.pdf
    • http://www.beautyvogue.ch/Files/file/mivupunoz.pdf
    • http://dent-pro.cz/pic/file/gifakopepener.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/1982105346.pdf
    • http://koryosushi.com/uploads/files/mujadazejimatusa.pdf
    • http://unseretochter.com/images/file/xijunugoxidekoju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sign+of+the+times+partitura+piano+pdf
    • 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_off0000b3e6.bin
23c2c14a74e0c4110b4fae54067b42e38c0f17d80aba99e5398cac396d142fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 11076 bytes
font_01_sfnt_off0000cd4b.bin
11365fdbc7d0e61fd81c70496eb0ef26ad8d0cdb66fc4e9df2048ccb84daa5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 17804 bytes
font_02_sfnt_off0000fa77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 16792 bytes

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