Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aac27dfd08e653b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 05:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae865125dbc4dbb4d02debdab29f1d87 SHA-1: ce42f43af41124174b0d17565acdf414a369982f SHA-256: 1aac27dfd08e653b260a9d350cb714f547ddeaa448ed245257dc1279c3e61232
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of many external links suggests a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=relaxing+games+on+android PDF link annotation
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902224720901985.pdfIn PDF document text
    • https://bor-diing.com/upload/files/71963748294.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109100318316805.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/40257433087.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/21033477264.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/museviwobezoto.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/dotifuvo.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/34314476822.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/wogetofewalozapavo.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wekab.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/de698a44915cb8a483ee189b76e4ab10/datexep.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/fenetegivimevisenak.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210904025006.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613859065942b---febase.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vidutuwebuva.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/87271722363.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/74987817980.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_9590AD53E8BF33C5.pdfIn PDF document text
    • https://hinaweb.com/upload/file/99623749717.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/82578070471.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/5939060077.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_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 10640 bytes
SHA-256: bab57bd8f862d05e91bb169134fa7b8c2acf8b4c0b904ab68a235734a043102a
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 17480 bytes
SHA-256: 8225da2cba04a3542d72a891f223584b4c958261bbe0f3c546aae30695d1441f
font_02_sfnt_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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