Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf002e046c8dff4b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 02:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ff7cdfbf50ef7a48e40d7e195185ae2 SHA-1: d8350c2ab3b61d6eea752a14cc1fb38950c64f0f SHA-256: cf002e046c8dff4bdd688687454d6912b8273d40708ae5ee8c4c91e64e4dbdba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded within the document, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://quaint-house.com/images/blog/file/fuwunejiritezexuvobapaxer.pdf In PDF document text
    • http://dieterheich.de/images/uploads/file/babakodegene.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/46652393801.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/32557964465.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/61567634358.pdfIn PDF document text
    • http://chayka-svg.ru/files/32834677384.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133e447a8f63---47998939659.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/sovole.pdfIn PDF document text
    • http://marymo.ru/uploads/files/nugogulu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tazatilifizudanofofefumon.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/ditutegalebimefopuvene.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/13112480959.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161329fb740517---77062237900.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/robibowegiw.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/45784099396.pdfIn PDF document text
    • https://codecs.ro/images/file/21869910816.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/30702382781.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/fitotukazusokedozig.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/99076916925.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/28977763388.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/88687595106.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/jojonabedamax.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/12825167964.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/ruduzufifunuxojup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=filmyzilla+bollywood+movies+2019PDF 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_off0000c3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C3 20564 bytes
SHA-256: 98ae6c197c91e3447afb687fa84b49e3189fe9b7b9e1855d438a449a76e29716
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 11012 bytes
SHA-256: 515693e6e6bb6177bf8fd3424b282c456b933e56d3693026b1c81cd757007576

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