Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf5e0e5e39fb729…

MALICIOUS

PDF

68.8 KB Created: 2021-09-23 14:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5378f08efbd633fbd8288e27fdb1e20 SHA-1: 35112d1bddab1520e5ae209210d12ca53b7195e5 SHA-256: edf5e0e5e39fb7291810792af60180190be468e070fe12f871f5b55ad34d1ca8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of linking to disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=csr2+cheats+without+verification+2020 PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bad52c4ba0---57567511366.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pepovika.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/5666781590.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/13552640357.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/67478612408.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/xozodifineselexolef.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/kogezujekimukezeni.pdfIn PDF document text
    • https://makenie.com/upload/files/87971359823.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/nixirisaj.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/misapamisonulojabukux.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/59999446501.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/75074630204.pdfIn PDF document text
    • https://aaaxxion.info/images/file/93349042876.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/48003861732.pdfIn PDF document text
    • http://schokozentrale.de/idata/zesevamonaxanupedukagut.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-03/images/files/fexalagesupo.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/gujalorupemez.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/jalik.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/76253909799.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/ketezarineva.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/88451531088.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zewaxewonutunedagin.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_off0000ae5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC676 10912 bytes
SHA-256: eb95710d3b570630ecc9e46b2b0f9ca0bba2e3ba3a0eb21dbe91a1e2484ee14f
font_02_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 14896 bytes
SHA-256: bd7288ae9b54adf6239705024a047cd9414177773eaf2d950b37462c1429938d

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