Malicious PDF — malware analysis report

Static analysis result for SHA-256 a307a86d9aebc6ad…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aebe48a7f6d97158a41767c52b7788cd SHA-1: 05ddaae72f65e3ca5c7c74ea9013a5f1898e2a8b SHA-256: a307a86d9aebc6ad7c6fd319ede90a5dba343ea9c468234593e07d243b9389ae
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to manipulate search engine results or distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8099

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://coffotea.com/uploads/files/202109011532016289.pdf In PDF document text
    • http://carbonelite.ru/file/48893631886.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wawiwiritikuligavujatafu.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/dufokuvug.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/10207603865.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/jogetosonupojajurize.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/tizonujaxinas.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/22526659654.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///14088827821.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee4a9d409---95195801904.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/0351418368.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/78370450420.pdfIn PDF document text
    • http://beta-rc.com/upload/files/7738579737.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/sijaxalesoxiliburitefajim.pdfIn PDF document text
    • http://iscelenie.info/files/file/23908463207.pdfIn PDF document text
    • http://vo23.ru/upload/file/28875210862.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/pubigagolovonofadogiv.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903225103.pdfIn PDF document text
    • https://doitoutdoorz.com/file/mMLAzEj5PEK6QE2z.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/teboruzudoze.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/wemobedusa.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/26928885062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=new+code+in+collectrobuxPDF link annotation
    • https://b2cdemo.tickets.com/content/files/21353445109.pdfIn 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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 10440 bytes
SHA-256: 85f428dd500c3114c49ad2d5c5db316e7546c18f2128f965ff31612e7c90ac57
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 17708 bytes
SHA-256: ba5ea906e43db3edd7c774d5fb7d45660b9db5b301ecc949e422fcf889c90098
font_02_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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