Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d9afc3f07ecd6d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 15:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94df7ae8c91cb825a9202cc70454b1ce SHA-1: a9911b2ee43cde4e89a1070fd27e138edb8554f6 SHA-256: b2d9afc3f07ecd6dc977389a52f76db0324696727fa483a72fe620d9a6ad96c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://drafthe.ru/uplcv?utm_term=cleo+gold+android+apk PDF link annotation
    • https://dnm.tw/uploads/files/202109200207245416.pdfIn PDF document text
    • http://receptlap.hu/files/26529912779.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/sisarakopitufavizuw.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/purexawukelijujifato.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/jaxefakeselezavafemabut.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/93743049784.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/mazamogatebururosudazo.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/jabodamafabelu.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/15353621064.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210919224519889303.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/39160728312.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/22362888456.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dofonaduzavuv.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/38243789126.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210906184746925240tuv0d8.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210917213006.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/93687599027.pdfIn PDF document text
    • http://china-steamboiler.com/d/files/46518713524.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/gipifan.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9o2albca6jl4q7143inb87gj0g/losafakuxag.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/wugulomubam.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_off0000af36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 10424 bytes
SHA-256: 57d7c865cb8427096d5516bfec4c6536bdd4f31d6316f8e224e4f6e03d3bc8ec
font_02_sfnt_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 15268 bytes
SHA-256: 67665ba8fb48f5be6602b627f2e339829a612e00f28e5a8df1b45c8118cb8200

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