Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d555e98fbaf081…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 21:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efc6da9c97db5c313c8a1c3402a23318 SHA-1: c52ba8e0b38e4353af2dd09b005f84ce8ea67a25 SHA-256: 95d555e98fbaf0816bd4599559f268159ce9464e37f49542ce51081f225d0a48
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 trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, designed to redirect users to numerous distinct hosts. While no scripts were explicitly extracted, the nature of link farms and the presence of embedded URLs suggest an intent to direct users to malicious or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://u15.ch/ckfinder/userfiles/files/45620303226.pdf In PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/34301489315.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613558779c6aa---najaw.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/175e7cd79effdc4242c92a9121ce4a87/subalinafizudovejarorini.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/52776137521.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/sasomesikoro.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/1131962208.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/1863419732.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/letukegedulijak.pdfIn PDF document text
    • http://dentherapia.hu/files/file/zotaxal.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/30067043553.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/24843472659.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/wixavowaxabovage.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13308286047.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/wuwosulonirudiguvitaraz.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vafuruj.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/vowukegukozezemisepu.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/81615014171.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/21280012349.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zetupunisojedegufaxidujo.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/50756352712.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/vizikiguzupofu.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/gusabudovuvokawiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wwe+here+comes+the+pain+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_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 10764 bytes
SHA-256: 9ac8416b8b3bcb4abb1e7f4c59d6b979cf91ce0c7cf770acf73814d3056dd6bd
font_02_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 17256 bytes
SHA-256: fad91a8c83038f74104a0a0cdf6d29b0f13aaa871c9d786e314f3bee8e070edc

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