Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7a55f44e8c658f…

MALICIOUS

PDF

86.9 KB Created: 2021-09-14 08:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d97c41a6cb83ab46462c300cc8a5eb3 SHA-1: 582bbc4a86eebcef7db51ef7efd0ba00d0226661 SHA-256: ab7a55f44e8c658f813a1deec11e9d2ca9616e1ce3649cdf7ab09dbb0e10ddef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on potentially disposable domains. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a campaign to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gazomotor.com/allinone/file/72646370038.pdf In PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_175447.pdfIn PDF document text
    • http://koala-al.com/d/files/panipemutujodaxasuneje.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/71150712881.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/labex.pdfIn PDF document text
    • http://duef.ru/public/file/wulumezelekide.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/latopedibolivap.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/50670555671.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/jinepesenakonemibalipomas.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/34360672005.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/25505692242.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/63815652510.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/diwajinorevag.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/bosazofejopijoji.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/mozep.pdfIn PDF document text
    • http://veitali.com/upload/files/tumudojuzod.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/26061520384.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/jemezipapugasezasagefoj.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/fewebenen.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-14/20210914022158403820.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/19962210991.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/kupilapaziwogiwefepogozus.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130a492d4fd5---28416222782.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/23736871202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=static+keyword+javascriptPDF 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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 18812 bytes
SHA-256: 84cd23e83b7e70fa4c248bfe174af532a21aa6290669632e8c9680e9e1ce4887
font_01_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 10920 bytes
SHA-256: 9f74bbbb121e0c4cb97dfc4c423894b323b0115d1731cff2117c707efef06811

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