Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fee10ce0c1077a3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 14:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1d40eeb64537ed83617c5c304fa7515 SHA-1: 18487928dba18792a0b85ec194db14fa24ac14bb SHA-256: 9fee10ce0c1077a3ef11d46aaaee0ec01affa04ee51521ffc2cd5c59192945fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing attacks. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=how+to+unlock+my+onn+tablet PDF link annotation
    • http://insureavisitor.com/userfiles/file/saruzoxuzaridejemimawip.pdfIn PDF document text
    • http://snsi.jp/image/news_file/5194042953.pdfIn PDF document text
    • http://ailizia.com/userfiles/voxudimavub.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/13996363615.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/40708843075.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/28147613523.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e2fa5ebc---wunaxobataboto.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/26403585296.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/31411643527.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tivijovif.pdfIn PDF document text
    • http://efsanepin.com/calisma2/files/uploads/sepisonolevegapoku.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/41512435563.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161391aa841d32---bazakadiw.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/duxufutuxu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sekaxola.pdfIn PDF document text
    • http://keramann.ru/uploads/files/44480416562.pdfIn PDF document text
    • https://actorconseil.com/files/file/8505092416.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/33832573412.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kawujigevarosawe.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/lajebozo.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/86718533331.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/44623305688.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_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 18988 bytes
SHA-256: 736e874edf4d35019459902cc00d13f05f0ec142803ae0a002d89778900e0323
font_01_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10556 bytes
SHA-256: 68d85bb84c51bb103100c7e8e75d5012f414bb662dd0f7e39f734dda9e347363
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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