Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fd4e7ec797d11d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 14:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 967356faeb05fa2f05cade48d1ad266a SHA-1: 6a32649c03261ac30407e526bd03c239dfa69f50 SHA-256: 23fd4e7ec797d11d86ff9209027a0b8a9e7849fa15f504ff9545c356f8e65ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm, potentially used to distribute further malicious content or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a deceptive structure for hosting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+full+movie+movies123 PDF link annotation
    • http://stefanourso.com/public/userfiles/file/37145990094.pdfIn PDF document text
    • https://bagstyle.uz/images/file/80288387740.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/3286186429.pdfIn PDF document text
    • http://rs-entp.com/upload/file/41686461024.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/timubo.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/guvubudikesafirorakibiv.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/givuwogetujopupaf.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/58191616862.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/89764173275.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/12316721738.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/20848581090.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/gudanefifexosivoletuzu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e8c5e2a---47931074584.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/dimolafixu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/9196253868.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/27478014027.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/20221689677.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/vigizorabadobulim.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/37011932666.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_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 11532 bytes
SHA-256: cef7646b4c4fcfa210bedf7df549b696c7a5ec9011cdc23907e50e73a3ec7b03
font_02_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 17448 bytes
SHA-256: c5cf71851b7520a801f3ff690bc1a49156108555d7738709103a7e071ef0df68

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