Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cceb554eaaa6eff…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 15:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67b125441706e90f6d12f1150895e09c SHA-1: 8721c96172b52e175adbdb8840850cc00dbbc639 SHA-256: 6cceb554eaaa6eff4ed4e7095b62fd60c81e6b13023f8ceae9a5e0f07140a6df
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, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation that the document is designed to host numerous links, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://editionsitaliques.com/userfiles/file/muvukoti.pdf
    • https://gloriamus.org/Uploads/userfiles/files/gapujizakuzazino.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jididefidagi.pdf
    • https://milosislandrooms.gr/userfiles/file/xosinosivifozifibinasur.pdf
    • http://geologocarmignani.com/userfiles/files/ropad.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/79163067799.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/97755483213.pdf
    • http://abwsalisbury.com/uploads/files/lireletagepazetusojo.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca32f4e1fa---miwitugozabarina.pdf
    • http://margheritango.it/userfiles/file/64653682029.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/figuxod.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/gefarenesibatuna.pdf
    • https://costabravas.com/uploads/localidades/files/78299079010.pdf
    • http://epmresearch.org/userfiles/files/21387808335.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/vixovikanonisanewokebo.pdf
    • http://werder-ritter.de/UserFiles/File/28629501017.pdf
    • https://amursvoidom.ru/media/files/42170498733.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/28751324974.pdf
    • http://celcg.pl/uploaded/file/rurezegubum.pdf
    • http://guerrazzi.info/userfiles/files/xapegavonuwarevude.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/48995719747.pdf
    • http://www.ekoforte.com/upload/file/kusupudelupotitavimuxa.pdf
    • https://itchanoi.vn/uploads/news_file/91277036378.pdf
    • https://kristaldicarlo.com/userfiles/file/34421140425.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=biwi+ke+liye+romantic+shayari
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3c0.bin
8a8e2199d17fac3a1e7d92e5d5b1dc4f9c07978c3ccd4be9d38838d2db21c554		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C0 17672 bytes
font_01_sfnt_off0000e1b5.bin
08af6334de521d766c0140156832e4248c86826c0eb9d4caef9db5f39f464e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 10840 bytes
font_02_sfnt_off0000faa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 16792 bytes

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