Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8467074337b2081…

MALICIOUS

PDF

87.6 KB Created: 2021-10-10 00:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0c4380fc8eed7f994e2df4e593aab92b SHA-1: 55221f327045905e26bda0c0ad5a89b7b7f83b4d SHA-256: a8467074337b2081444f2e580b5a14c0022adcecbe93b601322582ec9eca2359
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm on disposable hosting, a common tactic for phishing and malware delivery. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://likebarcode.com/image/files/20211005_134804.pdf In PDF document text
    • http://phuwangnam.com/user_file/file/xofibufunanimalo.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/88684272791.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/99172186674.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/67124537590.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7aa14957e---jifuk.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/35525855974.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/23568749477.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/xanigopuve.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/lurizitunenip.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/murujoduzo.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/pimidupometivebu.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109190233132934.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/milolovowirofan.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1632903048.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1615fcf30cc4a5---kovin.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/lumexuwitazifinex.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/69861206261.pdfIn PDF document text
    • http://polkovnik.su/upload/file/zodamu.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/pevaworexonaxupifaxolaf.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/fujozuronirarafaxez.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/wovugifama.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/wodizuboziriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fire+insurance+notes+pdfPDF 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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 18944 bytes
SHA-256: 335872b8aaebe2d5407db7481198cd109e7335c296318229c8c06192b75e81f7
font_02_sfnt_off0001386f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386F 10644 bytes
SHA-256: 001a87ce03aaf783567ba86e3fe56ec93bc1c14a4ea07d4be2280cea7e834b58

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