Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ad28be5ea30508…

MALICIOUS

PDF

90.0 KB Created: 2021-09-08 15:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b627c177eaee8f26211e6a01eeb92591 SHA-1: 6f030341b3bb78f92d1b9a436c592fbf441eaf82 SHA-256: b6ad28be5ea30508368c3a826ed0f7d07e5a59ebae435b398e2f98c59e3aa633
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests potential execution of commands, possibly via embedded scripts or exploits, which is common in PDF-based attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://oniceh.ru/uplcv?utm_term=flow+of+energy+through+an+ecosystem+worksheet
    • https://emmaushuis.org/pages/98717117545.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/lekakadadur.pdf
    • http://qdcmd.com/data/files/vejufipazuzub.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/94360552378.pdf
    • http://barcabianca.eu/upload/file/9809142400.pdf
    • http://internationalnetworksolutions.net/files/
    • https://journalofcritique.com/ckdosyalari/upload/files/wuxagifawefagod.pdf
    • https://careersourcechipola.com/files/public/magixeluvarizopako.pdf
    • http://hyeminshop.com/DATA/files/9836608077.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/07e0b3542296589c1aafb06d307babf1/44403297884.pdf
    • https://principesgs.com/userfiles/file/19787034326.pdf
    • http://adec-interiors.net/Uploads/file/bigepowow.pdf
    • http://derp74.fooden.com/UserFiles/files/nesanowokodonodirilalebi.pdf
    • https://taiwan-tiaya.com/upload/tiaya_official/files/voraradinutokifonuwupuvas.pdf
    • http://kemnhapkhau.com/upload/files/sifajirilupitu.pdf
    • https://tectrongim.com/uploads/file/xelisab.pdf
    • https://brakos.it/file/disajadelovomaraxij.pdf
    • https://www.retake.dk/ckfinder/userfiles/files/kopufefejidironumuvi.pdf
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/18582914138.pdf
    • http://limeitec.com/upfiles/editor/files/1970136246.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3022d357---5269713176.pdf
    • http://prochem.vn/images/uploads/files/88694520450.pdf
    • http://origo.ws/userfiles/file/65543385287.pdf
    • https://ourcampuswindow
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbab.bin
01225a723d1ccc76738a3dfd83d1e3c85adbdd8d23e6246d6fd4b5750431c732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 17112 bytes
font_01_sfnt_off0001283b.bin
9ac04baeff4a2fcc01938d3c55506e657b278238ea2106a4d4cfff72b5bf064d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 11060 bytes
font_02_sfnt_off000141f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141F5 16792 bytes

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