Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5b30c77eaf8e6e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 01:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e1f8b33871405a4160ab51119c1b494 SHA-1: 06dd864ec30d3fbb169796720a892984885c1f9e SHA-256: ac5b30c77eaf8e6e46ef28c5578b6577c9d35a4f16e8d2973e3321e4c5f6b43a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many of which are associated with a link farm heuristic, suggesting an attempt to direct users to potentially malicious sites. The presence of 'cmd.com' in the document text also indicates potential command execution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/1012752619.pdf In PDF document text
    • http://mirutte.com/newsfiles/files/nizorov.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/zezibifegerezozugawokup.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/8385611236.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/fiwomasisobibufalo.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/17849592203.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/wajuzazatewibiburapisiz.pdfIn PDF document text
    • http://biomehl.com/images/content/files/kazesozotugivobokaxujajos.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/67388483595.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/65489083641.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/01649b52863c3b615d338c94fadb3d8b/dexurumezexasu.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/nefokezexigetagedasagu.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/61700915161.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139285aebbc1---99537795957.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/78382343736.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/datusaridubukovuninuz.pdfIn PDF document text
    • http://qdcmd.com/data/files/74163383940.pdfIn PDF document text
    • https://dhesient.com/media/kivuwofe.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161392a865fba2---vexefexumusubitiseg.pdfIn macro / runtime command snippet
    • http://evo-models.com/uploads/userfiles/files/joniroxogexatixukunatit.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/tavudoguvosutowuzijopem.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sakebativuzukekavoganunip.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/40214705981.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/74401655484.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/94296524956.pdfIn PDF document text
    • https://dhesient.com/mediIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=stick+war+unlimited+gemsPDF 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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17312 bytes
SHA-256: 357d30ee67450e06216fe70a869769011a4e0881f3cd2cc420089630d8ae5da5
font_01_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 10948 bytes
SHA-256: 2ec4753854933332e4f431a1f0d363000ef6aa2a5f0fca01c2c53d282c398769
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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