Malicious PDF — malware analysis report

Static analysis result for SHA-256 66412a1cd9df1fc7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 00:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eafb4b20d0969d6e52286f50c6957b39 SHA-1: 5354e209e0138f39f8f95a8170c146d2ba7d1505 SHA-256: 66412a1cd9df1fc77d956ae916f3642373be95aac9d638562759355a30ed1b21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=fortigate+multiple+ipsec+vpn+dial+up PDF link annotation
    • http://hasanmasat.com/ckfinder/userfiles/files/xijijinexijilom.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53416911339.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/87751568668.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/79097046792.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/77134090174.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/9904947729.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/sawavitujixogikuk.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/20526780667.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dazoripizikokizukimu.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/susaburedekapowi.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/22911152854.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/tegigukavune.pdfIn PDF document text
    • https://dukupahit.com/contents/files/sewizujivedojesulagobas.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/jejid.pdfIn PDF document text
    • http://vitrine-prof.com/files/24451280498.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lmici05hf95auu73lfjl2b9l00/nanoganuzedabe.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/soxogigokonovoputaxovibu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d247f61---72570439627.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/65787322969.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/60870747870.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rotugukijuxokenis.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/97190953522.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/99208514481.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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 11000 bytes
SHA-256: 946b104ef712616e7e4122724a49a5a9111a766bfaa1687c878fab8e3b065124
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 17764 bytes
SHA-256: 924b89d75ec53fde19d8ce67a7d21623feb8046a3451bb41e70316d29e3117cf
font_02_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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