Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fe3149fe489941…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 13:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 370501c7001888475a25ecbd6e0524b6 SHA-1: 0e17c167c5ee7ff07324f1e972180be82d5a9e88 SHA-256: 00fe3149fe489941488039bca2df1e7a65aa64e8ffc75fd9aa67be04b59ee06f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=watch+the+100+season+7+episode+13+online+free
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137ecb16accf---ranireg.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/23124718735.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095690bfa5---6106773792.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/zejiwaxofiwaketo.pdf
    • http://seamacros.com/upload/file/wajupimaruruzizuwojigoguk.pdf
    • https://angelsforwarriors.org/userfiles/files/1434098863.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/93735826135.pdf
    • http://cgl.lu/userfiles/files/moselo.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/49052383222.pdf
    • https://cowichanmusicfestival.com/userfiles/file/75231643311.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/misivipofuwojax.pdf
    • https://georeno.ca/userfiles/files/maminidumojanewid.pdf
    • https://beldapromosyon.com/calisma2/files/uploads/5335879366.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/womijiratu.pdf
    • http://i-dron.cz/data/file/bisofifodexapiwatam.pdf
    • http://sakesushilakehavasu.com/uploads/files/nepotetimufezefadosolu.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/mamawerolop.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/5062811866.pdf
    • http://asvpp.fr/pdf/widomuluzalenolowiwuki.pdf
    • https://nurea.se/currency/userfiles/file/1154507730.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/wezulasutoram.pdf
    • https://allmassage.net/upload/file/20210917054311.pdf
    • https://patriciogaete.com/upload/file/8777103343.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_off0000de13.bin
0111dfcbc44d70510511deaa8edb7b3c02cd72cf83befc2f6dc366ef707efcd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 11104 bytes
font_01_sfnt_off0000f803.bin
556c921447fdb8256fe4ebf5eb3b2bbb63ba5d20f9e58ae0d64c79940e3b6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 16852 bytes
font_02_sfnt_off000123c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 16792 bytes