Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37c1dedc37b29dd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe774152ed2bea20fb439c1352c8528a SHA-1: c4f195ed4a8104853f0b854276e2eacfbc59cfe1 SHA-256: b37c1dedc37b29dd48183ba2059b81f73a537229e918988c438f6d97062b183d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=top+android+games+with+controller+support PDF link annotation
    • https://lostfoundglobal.com/userfiles/file/sevatijemepa.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/87361471498.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetademopimogefelasi.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/14302650337.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/63389996366.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/83814721185.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/45118658001.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/dosez.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/fuxufokinukorefiniwap.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/xaxevekunotiduwisulosabe.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/90999064097.pdfIn PDF document text
    • https://cowik.pl/upload/dawolupisesutevadeda.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/banibiwas.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/kisovaj.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2bfa67b2---29893398875.pdfIn PDF document text
    • http://coffee33.ru/archive/file/76857881489.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/22059862245.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/zomuxubavol.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/gelanuzalil.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/46414441769.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/podixejegomegamunab.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/58692121674.pdfIn PDF document text
    • https://tepihtrava.rs/files/82656678223.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613937a4767b6---pibowas.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/45013175338.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/82750555055.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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 17676 bytes
SHA-256: 013e47b6eb4b5f8b8097b43e7bd94c01938ecae81ef576f2f1097be29400f77f
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 11112 bytes
SHA-256: e1bc93afe15c292a1c79f2527f9cbc381c7ced162b398e03505b53313230ac3a