Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffc7a1075b7ca10…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 05:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3282522cd05e6c72f9d0aa3732aa8a77 SHA-1: 5226c38df48b9ca60aa324e249201ff9ce1e6593 SHA-256: 6ffc7a1075b7ca10fe54205cb749b11dbfe1e20ce84c13829e81ed5bcf75a05e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to various disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a tactic to obscure the true destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=ld+player+3.0+android+5.1 PDF link annotation
    • https://morethancars.eu/uploads/edytor/file/bebedezupabefafovi.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/5901996267.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/36620969473.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/tukamovagero.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/bupibuguwa.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3895643110.pdfIn PDF document text
    • https://forssh.com/userfiles/file/59228400535.pdfIn PDF document text
    • http://iscelenie.info/files/file/tunabosivupovazusekurer.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/peluwuwipidebimewokux.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/ferupif.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/75960589764.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6139036911.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/jinimixozukubebog.pdfIn PDF document text
    • https://blv.by/upload/editor/files/44808552072.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/janulixopozasaritigenadu.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/42192830974.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/50259638068.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613785c1a1b1b---wanegapipavag.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/porinuxowisikefefoxesuke.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/52857549503.pdfIn PDF document text
    • http://chpcentre.com/files/file/gimonotogaladixibu.pdfIn PDF document text
    • https://dafelia.com/files/jexubuxoriforimazagid.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aea73be62---5840792117.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_off0000aec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC7 16704 bytes
SHA-256: bf68d4bc64461715286f5dae9d3d0659ff447105488ca2338b6fede1cb561a42
font_01_sfnt_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 10736 bytes
SHA-256: aa61f6921d3d4df5747af0e031140ffff121b3907e04451e683ac5a52d939661
font_02_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1