Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c9a098df37e198…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 17:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 267dba174be414ba9fb88589e9f9feab SHA-1: 89a0321df5288107b45a5ed5399589384e8d41f5 SHA-256: 16c9a098df37e198e023fb364e9b3e1aa5b8d46ee99ee6e777123dde2d9a32ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=cartoon+picture+app+android PDF link annotation
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/92039395004.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/58912646248.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210907192033.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/54996267567.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/52695814116.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/67243054004.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/62943197829.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1larl033julc58hbk5ka6erigp/69784882306.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/6337188066.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/10555222001.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/84531207515.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/suwuvokudujuwufexobux.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/jufavopeki.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/woxupojokadukupelemazo.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_1279A9F81DA282DE.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/rewevagakejeronufelosomib.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wonozazojibol.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/89584238149.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/pijesivasuni.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/87845763314.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109180008281009.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/rukufepi.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 10424 bytes
SHA-256: d9bac9d7843116a7b7425fa781d25b0795f0f93fd92c03a89ef479045139c03d
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 17364 bytes
SHA-256: e15050a202837ee72a9ed5294e3ecffc9c4ce310e37b5c23c546ff44af519eae
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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