Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc45dbc312233f1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 12:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c71ebaf16a658dfaa04c6c72b588015d SHA-1: 1a2ff425103578e7d625f310ecf29c4f9425197f SHA-256: 0dc45dbc312233f1f84299f75e5a383de1fc5803819f6f6e26cfae2be21b2238
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-like sequences within the document text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4eeeo82tkfsp2qjltv56js74b6/23132638480.pdf In PDF document text
    • https://pezenasenchantee.fr/userfiles/file/1179940480.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/kiniv.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/34134843253.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gadiduvokanatumuzuduw.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/51260493753.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/40231263009.pdfIn PDF document text
    • http://a-pluset.com/userfiles/51839756324.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/pusitiwuxuxazewos.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/dasijonuvawupenomesox.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/mirobufilefikutetujivikap.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901081705_117819765.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/1480025930.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/rirotixoraperotux.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138917f39444---muroxewov.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/runowopunugevudakodabibal.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/73522960268.pdfIn PDF document text
    • https://securitydm.net/slicice/file/8519016966.pdfIn macro / runtime command snippet
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn macro / runtime command snippet
    • https://termofriz.rs/files/40519962251.pdfIn PDF document text
    • https://123natura.com/stockages/files/zosowuduv.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/72603431988.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/13330409617.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/xezipiruju.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/23248242279.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/71137610257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=videobuddy+mod+apkPDF link annotation
    • 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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 10452 bytes
SHA-256: ac5b112ab2fce6fce7a72bda07df0e7a257dd700d39cb86cf79179c83ac84402
font_02_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 17636 bytes
SHA-256: cd55f5e8310ea713168d09f7598cae196f53d0b8f3f5fc082f9544753e4521ba