Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcd0c868ee43aef…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 08:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9f57183ce8de016b2e4f0d85aad3f29 SHA-1: 8becd196985279b1e85954fd8382f54c8efcc106 SHA-256: 4bcd0c868ee43aef519dd26d8a1928e4efb1bbf183d02c9e10b5079da7dc8a96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=fake+followers+trial PDF link annotation
    • http://wtmongolia.com/materials/file/30571230220.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c5ef0ea4c2f491f44eb5790a716d90c6/jukiwanedeg.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/215433323.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/80644896958.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/58492436079.pdfIn PDF document text
    • http://gnox.vn/upload/files/gituzatusavupepiresuruxab.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/bosowojat.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dozufijuvejutepudujitox.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/86909434490.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/34117211096.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/66918048952.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/86095832151.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/89836906506.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/zixanorevuwovurezakixu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7db32cd0---sabolepatawisotunakajepo.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/vesuxoravoratewudewifugo.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/xamixikofagisopevuser.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/birajotoraboli.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/xubimikubebijabomof.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/rivekapuwamexakurugagus.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/12360061658.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/xokusutiwanozu.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/berebelukadofuzidigo.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/vurizigoz.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10260 bytes
SHA-256: 940032244110cc7ed001d6746d243314a95ceb822a48bbab44ed88982df8fdf5
font_02_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 20408 bytes
SHA-256: 214ed7f8468d67d68de93a6d5c4321581d0937362c50973aa88478cc475b6e9a

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