Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dec186a8fa172a…

MALICIOUS

PDF

80.4 KB Created: 2021-10-06 01:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bac56591e611fa904f9aa1b018929945 SHA-1: 605431f5c04df4e341721072f7fdff1bcfb6101f SHA-256: 36dec186a8fa172a920c739c9f92514bc61f3b86a4f44947e1cb8357b28f9f26
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_LOLBIN_RUN_COMMAND' further suggest a malicious intent to host many links on disposable domains. ClamAV detection confirms this file is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4058

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=mhw+this+is+how+revolts+start PDF link annotation
    • https://atrax.eu/userfiles/file/74887025407.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/7481174226.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/3704947830.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1615cc146316d1---53572201919.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/sudive.pdfIn PDF document text
    • http://liluby.com/upload/file/zagemunufajebijon.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-30/20210930181435663853.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/22968851690.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/peworojifawaletozig.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/zusefimuvit.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/89867663543.pdfIn PDF document text
    • http://e-sheremet.com/img/sosuzudaxizidelem.pdfIn PDF document text
    • http://3sdent.com/upload/files/77263516543.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/73352098770.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/durifelidavanuretanur.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/nuduxobuka.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/7372878319.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/13235637433.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/83603233186.pdfIn macro / runtime command snippet
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/bojunelozuwiforugufufuli.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/34e6d4905b9e60daaca774d968b7c315/timanirufolazemesubewopuj.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/suniwozod.pdfIn PDF document text
    • https://bselink.com/userfiles/file/jijaxuvebuvupu.pdfIn PDF document text
    • http://wordtmann.beckbauIn macro / runtime command snippet
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 10248 bytes
SHA-256: 5cc41d8cb43b81b2b86ea5ea3825e4d96523e2b27dd79fc7627180b8a754519a

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