Malicious PDF — malware analysis report

Static analysis result for SHA-256 510a16240458ffd4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 09:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33e24ca52fb431077e978c163cf6a712 SHA-1: 4699d45765f862944b82553514e4665e2d902940 SHA-256: 510a16240458ffd48926a376359f5fa49583f9c77e695ff9f3bbf36907350030
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure itself does not contain readable content, but the presence of multiple external links suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=gta+sa+android+timecyc PDF link annotation
    • https://casasholidays.com/scgtest/team-explore/uploads/files/zojoxefetetobep.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/14725980402.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/56912335357.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/37786416567.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/18059282998.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/glc4kf1hve2aq9qale2t3ucoes/wisaze.pdfIn PDF document text
    • https://0900107678.com/upload/file/96761943914.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/jimedilijexodekav.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210913151926.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a2dc9943---99746225530.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/92391790695.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/52363943783.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/potuwotofimugizibineb.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/zeveviwazexojurab.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/72918624372.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/tezageg.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/zupemakirisapimep.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109130355075134.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/84272030705.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/48877011132.pdfIn PDF document text
    • http://askaudit.ru/price/46541077777.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/83220341561.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_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 10636 bytes
SHA-256: 1690f622516614fd048379f5aefb7ce6eb0fcab95b84ee155944ea406af8f31d
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 20392 bytes
SHA-256: 003a5a29e8123f88057ca7ae92aba29549b5b2b1fb5a0ff228a94ae9b528886b
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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