Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca922fbfd1999c6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 17:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc67c6104789d0e98f8393db452026bc SHA-1: b054110547748c1b7f22ab3982e627604b2f3dd3 SHA-256: fca922fbfd1999c64925c1da755acbc100d63312b0fad6e17ae903ef382f8dfd
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a multi-stage download or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links, pointing towards a phishing or malware distribution attempt.

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 http://hanasushichoice.com/uploads/files/gapepuwemitawixusi.pdf
    • http://hutnia.pl/userfiles/file/galabawiwalugosumegixo.pdf
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/62477829053.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/nuremedujipizegiv.pdf
    • https://slide-bearing.com/d/files/46642457590.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/nesofukogeferakawoxek.pdf
    • https://ruh-center.ru/userfiles/file/nenukekarumekalasimoged.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/dejasivar.pdf
    • http://turar-mussin.com/userfiles/File/fuxufuvu.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/72950374302.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/gonipomuxiga.pdf
    • http://b40555.handyfriendship.com/upload/files/berorafi.pdf
    • http://majortaylorride.info/images/uploaded/file/nawufijabexinoxub.pdf
    • http://qianxish.com/ckfind_image/files/wanuravekuzujadivokexud.pdf
    • http://thegioixedap.net/upload/files/zusavagusogoxobironuzivez.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/88ef45296876efe0da745814c5107449/52507573094.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/21079557453.pdf
    • http://www.umadai.com/ckfinder/userfiles/files/76452579843.pdf
    • http://wittymall.com/multimedia/userfiles/file/sejopesut.pdf
    • https://newcar-rental.com/uploads/files/202109272028181253.pdf
    • http://lightofislamonair.org/uploads/files/fenalizufesoxetituve.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ffa31c309---batokozumabot.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/36301334353.pdf
    • http://brkvinc.com/userfiles/file/janoliwo.pdf
    • https://sokolzgierz.pl/web/uploads/files/pikevunipajupelerotonivib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=eskom+se+push+app+download+free+download
    • 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_off0000b35e.bin
cbf3b4fbfe7d83d1702f14b588dcc5dbfb1b43e49f1864948ddba84bbc63529e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 10836 bytes
font_01_sfnt_off0000cc34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 16792 bytes
font_02_sfnt_off0000e446.bin
011ffdbb9453db0096eeaea8f3f67914492362dfb6453699b07af2ed6c27b8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 15728 bytes

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