Malicious PDF — malware analysis report

Static analysis result for SHA-256 316163c8bbd74555…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 17:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad6d2493f146895769ab547defe6f1bb SHA-1: 8d1ea5a8700bf9bb395c7f39ccfe5f5701a5036d SHA-256: 316163c8bbd7455538fc48f7e9b0bb7439473f57330496799b403e6e980168b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to disposable domains, strongly suggests a phishing or malicious redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://printjet.pl/pliki_user/File/luturokisowotufagisewa.pdf In PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/kosumuzagalezizulujefupa.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/13488850426.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/zivubolofulev.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/87703250985.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/sotupelelipawipigimozisu.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/fuxolazuwenopeke.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/9657585408.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/27712678054.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/tujugodanixolurakevumijuk.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/22100250504.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613205af00b95---munumozupo.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/80609977069.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/ruvamovegazu.pdfIn PDF document text
    • http://selidbe-beograd.info/files/12483029913.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vojizudujanusazupedaro.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/94720593744.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/74206926949.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jurunelulanufedagovo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/2452289329.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/47545060592.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bfb2b8fe---jajomitofigugebitojezoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mobile+gun+games+onlinePDF 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_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 10488 bytes
SHA-256: d170937a169355d094e23d450cfa94b73ab5232370972e5c3c3bcbebe1c3dbd2
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 17944 bytes
SHA-256: 751e0fa318f7ab1a36ebe700fda3671f5f5f99a87cabb38ed6b1da893507f12a
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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