Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a84de3f4c52416e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 19:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 407df1a07cffebf82242491a8a9bfdee SHA-1: f7ce27f56d5fa72e06816536fc089c6b05271380 SHA-256: 7a84de3f4c52416e3ebafd80305ef48f93832bdb1fdf7da0d6045e37b554673e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point towards a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a detailed analysis of its specific intent, but the overall structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://weiddy.com/uploads/files/202109080022416729.pdf In PDF document text
    • http://naturestuff.nl/siteimages/file/51398517031.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/33249917260.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/87792910522.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/65091572153.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/filukosuronipegilixobi.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/57761183310.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/zazav.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/bivat.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/jiturovumezutotogofi.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jurumazodusetu.pdfIn PDF document text
    • https://migger.dk/userimages/file/kozusipozubomikunovixelex.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/kamasoneselirufupega.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/vibedod.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/7923708985.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b4d43a1e---44692090393.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908142904.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/tafowidalorelarobotex.pdfIn PDF document text
    • http://szcftz.com/upload/16505425299.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136671270eb2.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/24222916754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ielts+writing+task+2+introduction+phrases+pdfPDF 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_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 19024 bytes
SHA-256: 4805110434daadb693f9b2741d19f195f5b884e4c936efb100e7e69c6910a3eb
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 11248 bytes
SHA-256: 6d7dc65ad36077f274c6d680eda41183374d60b2981d62b8583f286512253fab

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