Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8fc077a6d7fe03…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 01:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55bb8c3eed3e0061b8c5fb4b2408232d SHA-1: d43d391146eca2524ac21e346fb58f86ba1c8627 SHA-256: ae8fc077a6d7fe039c8065ddc20672aa9264878d6d9e852b458d78898091dfe9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=percy+jackson+lightning+thief+read+online PDF link annotation
    • https://mamotato.ro/userfiles/file/36529699636.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/80892364325.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/gazuxugenabogelanokiwopif.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/luliwevuvufawidubejuwetiw.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/muzuke.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/82394017212.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/91855916189.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zoxeloxenufi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vuruzew.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca1a37f744---xowebili.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/29838049420.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wumufada.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081691f4a5---jomedajetesatagerog.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/23227729165.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/21821808300.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/47696900822.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/moxadevevanubiwigexaj.pdfIn PDF document text
    • http://odumakus.com/uploads/files/66561195656.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/vifizaroxuvufuwisidituma.pdfIn PDF document text
    • http://feminella.ro/upload/fck/67830077723.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109112323201786.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16549301546.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 17200 bytes
SHA-256: fe9f047098222e8cbf866f347ff17d538591ac14fe12ffb20c99feb8e80f87fc
font_02_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 11092 bytes
SHA-256: 0813460a1dbea8372eb70bfb2aa806d63a39cc9b196f967eb0883c0e8f5e3897