Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff6c39bdd305256…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 01:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64b7f20f539cec043eb73979d63bec74 SHA-1: f2c1b46048ec0308185f9b7b2ec8ed3395e8f4bc SHA-256: aff6c39bdd305256dc6ea955b8f3b122db1f35198912dda7fb73b01d9473d624
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 numerous embedded URLs, many of which point to disposable domains and form a link farm, indicating a likely attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://eksternest.be/images/file/32238947920.pdf In PDF document text
    • http://xaydunglenguyen.vn/upload/files/bbbfa6.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/61645278603.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/25677024367.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/47033797819.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/79376665586.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109060551326616.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612F57BFBFDD8.pdfIn PDF document text
    • https://moolans.com/uploads/files/49601655182.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/23ebace3736135619c0351252f8dde4d/47983260384.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dawazudebulonefuxi.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210901172444.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_BDE1D2F536924CCC.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/xilugavelidomasujukibusom.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/ketadogujatixiberavapebat.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/8329937415.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/badawew.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/72543375397.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/takokerowebokimoxawisabal.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/50412156394.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/2601569826.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d82de22791a6ecd522e8de1c48e75e77/lodojokaz.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/dofirelupikupaxorezanafod.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/896327456.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/jiwusafalunakab.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/37096296844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hunter+hunter+arc+orderPDF 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_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 10252 bytes
SHA-256: d6ed6d52ad642e6c647ee0bc399aad31db7251f086f74726b4d69bee71bdd080
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 18272 bytes
SHA-256: 7b366affe7794c1ee74de862297974703f594215d5e1461e41bd108b414600b3
font_02_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1