Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e549575d3d88e25…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 05:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94c3cdb6cba8d32481f2d306fceb50ca SHA-1: 1da499f70726c6e7baa3b21795fcacc534c9d32e SHA-256: 9e549575d3d88e25ce3edf8c7a61885ae542e8561f9e9b69399dfef37a245a69
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution campaign. The presence of 'SE_LOLBIN_RUN_COMMAND' further supports the execution of malicious commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • 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://nomylo.ru/uplcv?utm_term=how+do+i+stop+my+phone+from+updating PDF link annotation
    • https://lmbri.com/WYSIWYGImage/file/22434271323.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/megijelenakalaleganof.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/loxepalipolawe.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/97753870046.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/vudawibekesi.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/fevekinanurum.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/timesobuvegunak.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/86888969192.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/7620846.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/24504151442.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/21395869619.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/wonumezefos.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/6329573861.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/batapi.pdfIn PDF document text
    • https://termofriz.rs/files/23578835758.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/36885211740.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/20232693065.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/59852843041.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6132568815ad3.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/bavetavufek.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/81796634174.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/58903335132.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/jepesogazeno.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a93374856---nafadobo.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/pulikinufoxenovusa.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/piwamefipobagew.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/82273515370.pdfIn PDF document text
    • https://pinpointIn macro / runtime command snippet
    • 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 11192 bytes
SHA-256: b7119b16e942a70f50263cd57c3f799dbb9b51a57e3570705c0f78910905be14
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 18968 bytes
SHA-256: cc67951a756ddcedf6f6f31963050bbc5e4c9ab509f20e393ed0e6c4058f6b7e