Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81ef6e5b8dcf4b2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 09:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1385cb07621206bdb852dbf7fd2a18f4 SHA-1: 39519be251762957e7558a3497648cb30b0441fc SHA-256: a81ef6e5b8dcf4b2073dae1a7ee2b6d45692de4c43a962f52b3943747dba4417
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=how+to+see+how+many+downloads+an+app+has+android PDF link annotation
    • http://abovomedia.hu/_user/file/ditekidi.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/pupumogamugabebosifij.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/vizerewekivimuviture.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/39840869759.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/20113255696.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614007a722948---70937997479.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109121257394547.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/rakemepakoged.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sowonubikifebigadeduko.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/nopinekonomijejivo.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/jebigizasifofoxuj.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/rixepuzav.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/xeliguj.pdfIn PDF document text
    • https://ms02bet.net/contents/files/66766138801.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/tijuvurexizo.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/fakopikamujotubixis.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/rosusef.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/71697465632.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/78999173486.pdfIn PDF document text
    • http://platcometals.com/images/file/giridemugepofujepodep.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/11800319297.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c26a718a2---juwugijuvoxa.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/jebozezakunefibunawilem.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_off0000c393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10848 bytes
SHA-256: f86188ff0ac3351f25c8aeae467738dc5a03e03ba439510254869deb985b67fb
font_02_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 17632 bytes
SHA-256: f651090501578a1d226a7df8b304371130ab1159607fd3410defd55e85068bfe

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