Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ba3720ab164469…

MALICIOUS

PDF

75.1 KB Created: 2021-10-06 21:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a7066afe17e35eec8eb03230f3bf516b SHA-1: 7fe832645a2a7db9a171e7dfb3055b1aa5ccb68d SHA-256: 09ba3720ab1644690401da05af173adbe53f31e81da0320dbea77d488d0a4873
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tsydesign.com/userfiles/jws/files/15310187131.pdf In PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/vijuxelomusorifewesexol.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210906173320_762918564.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87686920c---94119453036.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/71180008274.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jafomufuni.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/71792566217.pdfIn PDF document text
    • http://pakianco.ir/data/image/uploads/news/files/sulajusazimebaderob.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/449762876.pdfIn PDF document text
    • http://hijoin.hu/editor_up/21991153673.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/15635116927.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/kugogipogideloxolege.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/93605924292.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/josapano.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/6007410594.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/wumasowuvapowe.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/poputudegibilesexi.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/5853865279.pdfIn PDF document text
    • http://poliinc.com/upload/files/79900401270.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/fabosijakuzinuzivov.pdfIn PDF document text
    • http://lejuriste.ru/files/file/51207416657.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/sipabesamosep.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150a05ece341---kosawizojoperisu.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/70842571020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=inverted+french+braidPDF 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_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 16268 bytes
SHA-256: 0106b597799a6c975c169a56e719b4245fb2a347e17c456c80ebb596758caa4d
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 10396 bytes
SHA-256: b390a7d63aac3fbf4b31371a68e94b59295bc44572a391c4da09685781dc5a60
font_02_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1