Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3e43cab60ad048…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 22:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 374bc03fd0dba9b56c7ec5c7cb2807b2 SHA-1: a5f078f58e14df9f26024412a2bc9681f77eefd5 SHA-256: 1b3e43cab60ad048ee15a34b6c011c0e9893c571675a3e14917da9fe6e892457
126 Risk Score

Malware Insights

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

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 domains, many of which host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://skillmapmagazine.com/ckfinder/userfiles/files/14335825026.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pigiwuruxaxefenexeromepi.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/31154523657.pdf
    • http://tiguan-wiki.ru/file/92960799163.pdf
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/pebarosekedusedula.pdf
    • https://cabsfromheathrow.com/userfiles/file/97127863055.pdf
    • https://www.passion-rnd.com/upfile/files/2021/09/05/volejiloperutum.pdf
    • http://huh.hu/UserFiles/File/22660082951.pdf
    • http://location-venise.com/italie_documents/files/162864582.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/58980784220.pdf
    • http://ichieh.tw/uploads/files/202109080613112498.pdf
    • http://vvk-wiedermann.at/userfiles/file/74551708523.pdf
    • http://crosswaysrecruitment.com/userfiles/file/sotofesivawegewevexobo.pdf
    • https://serwisnawigacji.pl/userfiles/file/3718717015.pdf
    • http://kowel.com/ckfinder/userfiles/files/1630749594.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/59821622674.pdf
    • https://bulendengin.com/upload/ckfinder/files/76064095037.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338047dc56c---2187341240.pdf
    • https://liho.cz/UserFiles/File/5324528373.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ff77da4974a7a0b5f2be9e442b74f9d6/jizat.pdf
    • http://www.moyekolodin.com/files/zazoma.pdf
    • http://netmode.net/app/webroot/uploads/files/54895912500.pdf
    • https://tempegaring.com/contents/files/jukavuteropopupogi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=testing+html+email+rendering
    • 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_off0000b922.bin
5961e0f6d3d38cba87043c2d21a2e0744c6b4ac0e9a89dabb1f7b1a11241a308
pdf-font-stream PDF embedded font (sfnt) at offset 0xB922 10536 bytes
font_01_sfnt_off0000d0b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 16792 bytes
font_02_sfnt_off0000e8c2.bin
299dee020441fbaf3877ca75d2bf879593e9ce4e18765a5ae3804782ab94c23f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 16872 bytes