Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8069a1fefc2e27f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 22:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 353514b28c6ca95ee1f01f8b4cf87d45 SHA-1: 22b4e3f5bfd0cbfaf62d3edf94ecfc11e07ee0b4 SHA-256: c8069a1fefc2e27fefdf69afc315ba343b2b22ed76834e6590d9845ba12dbe5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://szpital-sulecin.pl/images/fckfiles/file/magimegajigusoka.pdf In PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25039126927.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/jizedatedimev.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/tusegogapalirumo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d1623692---tagubafox.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210917054756_eml2ZWRhYnVqZQ==.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lagawategowepokulux.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210913014802.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/vofuvusigadafovulixi.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092112472460.pdfIn PDF document text
    • https://checkmavandon.com/asset/site/files/95994720164.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/waxuxu.pdfIn PDF document text
    • https://nasikampung.info/contents/files/65283657772.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/miduxijetetekukefed.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/xikuxuxatuwunejiwokuvom.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909012331.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kidoxiwanibabuvazi.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/5111197057.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/fodamumapuxuwaxuw.pdfIn PDF document text
    • http://prestopc.it/upload/file/fenizife.pdfIn PDF document text
    • http://dominant.name/userfiles/file/jubowofevirawidumeraw.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c14f9f3a6---juminosewolejobif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+apps+in+blackberry+z10PDF link annotation
    • 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 19140 bytes
SHA-256: ec7bbd9f9e1c01b72ad683c85360e321ece00c4fc32955cfb1ced9303ca3f95b
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10972 bytes
SHA-256: f0e51b64c3d36c164cae809524c446d5e90717a318ca7bf12de69dfd226c58d3

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