Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5191c20aaf87a2c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 03:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8a709aa8514783535f88b45469377731 SHA-1: defc371adfef45119970fed843a37864ffa74a89 SHA-256: f5191c20aaf87a2c94192978d8fff16eeed6fde55f0c792aaaa0f3c7779401d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://3e-machinery.ru/app/webroot/filesfiles/mawigufudugiworelabepoj.pdf In PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tekanabifegeroxaxopiwin.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vapetaxoboj.pdfIn PDF document text
    • https://vpmemorial.net/images/file/16214622451.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/fawadi.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/29992613889.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/92206521347.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/maruxilaloxujaxowadofip.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/guloronaf.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/6156147772.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/xewomabakiwijawubibibaji.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/pekozaf.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/9536500117.pdfIn PDF document text
    • https://scalping.ir/data/files/file/75957401343.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d68c413c---87024300172.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/nawobetefajafuwo.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/ruwebori.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/giviv.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e58ea339a---vujamavusikozeba.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/69519367737.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/78487900056.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/90915929593.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/45697154902.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/71873069288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=flappy+golf+2+unblockedPDF 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_off0000b924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB924 10880 bytes
SHA-256: d6df7ca84b4b187f771b0109baa0ff4387c689d7d9d74906e20f3333253f8c68
font_01_sfnt_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 17296 bytes
SHA-256: b6164914eaf6ed4adc8c098306619a9bba6f2716154e7d361c3b7450967da7dc
font_02_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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