Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6911b5e5de0455…

MALICIOUS

PDF

78.4 KB Created: 2021-09-10 21:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 035fa1c2bd29c6ba6ec268c662205aba SHA-1: 0640fdf663b069215d0ef52463a2e36d3f084d31 SHA-256: ca6911b5e5de04552e2b31a4dc7e0ed4b98608c90c29c6834dca4f80c46fcbfb
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 distinct domains, suggesting a coordinated effort to distribute malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://www.tahi.hu/ckfinder/userfiles/files/zutoguter.pdf
    • http://thechitay.com/uploads/userfiles/file/tixelutinaganejuliwuvim.pdf
    • http://mobilni-kadernictvi.cz/files/file/96898571873.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/litiwukokexolijalolemiwu.pdf
    • http://lynxauto.ru/userfiles/file/17134425335.pdf
    • http://promocode.lu/userfiles/files/12632055669.pdf
    • https://successalpha.team/upload/files/dupukilegakogili.pdf
    • http://seowonbattery.com/files/fckeditor/file/4788035756135c959e7220.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/seziwaxadav.pdf
    • http://gattoneva.pl/pages/userfiles/file/fitadijitedawalo.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6a363715aa3fb5434dca38d2978ec018/vawaripovafozominuwajom.pdf
    • http://80tner.netsociality.com/upload/files/suzimedabagasajovofo.pdf
    • http://rainhouse.kr/data/editor/file/72495585061326113619d0.pdf
    • http://bannermaul.com/userData/board/file/39044488578.pdf
    • https://ambient-interier.cz/files/files/35150679560.pdf
    • https://matfreklam.com/calisma2/files/uploads/sazoxedesape.pdf
    • https://iwistw.com/upload/files/xegilebavideweg.pdf
    • https://hotelite.in/userfiles/file/4736503016.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64097325603.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/12916608438.pdf
    • http://kodemari.info/data/files/suteravajojapubozeper.pdf
    • http://dpholding.ru/uploads/files/vizifasaropuvewopo.pdf
    • https://tumujerrusa.com/userfiles/gupuzimexudasibalivu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hitman+absolution+android+download
    • http://s250801404.onlinehome.fr/img/uploaded/file/52939467660.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_off0000cdc8.bin
e929c02356d8844347a8e55af83225b21cf550a5b4bc0bac07fe51bf79b17ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC8 17760 bytes
font_01_sfnt_off0000fb97.bin
d62417c322161851c0d63ca6037fe421ac88d4f4b1c25573ba0b2bdff8b70b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 10596 bytes
font_02_sfnt_off000113bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.