Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91deafa90d67f8b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 17:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 372c785bff559c9d7590164f5c05ae51 SHA-1: 923ed5c1d84e5fb5710ea5cc05ab12708913cb75 SHA-256: f91deafa90d67f8bf138cb92bdd51957a4f941e4f7fdde9920f88dadeacb6162
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=moj+video+apk+download PDF link annotation
    • https://worldcastlive.com/userfiles/file/1687970412.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/94534095355.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909195148.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/40173371580.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/15019962571.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/zijemux.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/96070540476.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/25382485110.pdfIn PDF document text
    • https://harmony.im/userfiles/file/91229307719.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109121735344837.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/bovileda.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/zavimesibuki.pdfIn PDF document text
    • https://protrialse.eu/files/files/ponem.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/bubomap.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/rokosup.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/sevufumasutidilibexem.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/86421169128.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/53332630401.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/sabuvikeruxejogof.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/53797491359.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/71500075586.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/6070826493.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/dajakoramasevugix.pdfIn PDF document text
    • 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_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 17988 bytes
SHA-256: c31f993efafa9109382d5fadaf8d37dd93c2b6ad38e0b5495b79033b42966564
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 10384 bytes
SHA-256: 531d188f0a46d0bda01a58a306bdc68f16cf9966e04dc6d074704679ef2131e1

Open this report in the interactive analyzer, or submit your own file for analysis.