Malicious PDF — malware analysis report

Static analysis result for SHA-256 860325e121de0bdd…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 16:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18fefe4ccaccd32d641f4c5bb3809fe4 SHA-1: 9202c00f86af5e761b3d65ec57e114ca030169a2 SHA-256: 860325e121de0bdd49e7147e46dbddbd61542f659fb2b46d4085ab33ae75ba66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to suspicious domains, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to host many links on disposable domains. No scripts were extracted, but the overall structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hit-air.pro/ckfinder/userfiles/files/buxakufi.pdf In PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/jazegareju.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/8907379617.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mekaduginobo.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/52770998331.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/29914619565.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/fekujoja.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/vedikolir.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/vuduxawevimogozukemu.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/68769147921.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/29892079029.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/maxedazosirelone.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613526624ecb1---94964040541.pdfIn PDF document text
    • http://techmechengineers.com/uploads/24733867083.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/24767200290.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/98408308800.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fuxitagewipilagotigusoxux.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/fatazuwimeludawi.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/musafazarabufefisu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///72951548313.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/92269495168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3x+vpn+mod+apkPDF 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_off0000b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A5 16684 bytes
SHA-256: de1965d858ad15895dd48c6d1452b70789042f0602dbffba6fc4ea2ae3f77323
font_01_sfnt_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 10252 bytes
SHA-256: e1ce8a6c63142e07ca669c0be4ac4a6e4129a082fafe2432c564b4ebc6b0046e
font_02_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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