Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f384b39228fbf12…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 09:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbc118a9f4f78c5bbba14770d7badc0d SHA-1: 0392ba6e0c173f63258d022a571026c02314610d SHA-256: 6f384b39228fbf12b21f4a8b941417ba729a739d7faf63007c9e339036e7d4c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of phishing or link farm schemes. The presence of numerous URLs suggests an attempt to redirect users to potentially harmful content or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=play+minecraft+education+edition+online+for+free
    • https://dalba.net/other_files/File/38571329501.pdf
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/fuzax.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/gakosuwiginiv.pdf
    • http://siddharpeedam.org/userfiles/file/
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/ravobuguxamefesajaxunuput.pdf
    • http://qianshunqs.com/admin/upload/10111890466.pdf
    • http://jyczgj.com/UploadFiles/file///2021090819532496.pdf
    • https://riolospettacoli.it/filesUploads/file/mawupim.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/zatasosuxapu.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/88542685969.pdf
    • http://donauwell.at/userfiles/file/wewakokuxuxe.pdf
    • https://conexkarvan.com/cache/fck_files/file/foseg.pdf
    • http://icltindia.in/userfiles/file/93132065784.pdf
    • https://emtracing.net/userfiles/file/zatizowupovozuvu.pdf
    • http://aimecostruzioni.it/userfiles/files/bapojuwimejonilaruxoji.pdf
    • https://gppacdatabase.net/userfiles/file/bivikeduruvalexi.pdf
    • https://biocenfis.es/uploads/assets/file/50603259997.pdf
    • http://studionegro.net/userfiles/files/1023059622.pdf
    • http://electriccityusa.com/images/fck_uploads/file/bakeraruniwumob.pdf
    • http://webs123.com/userfiles/file/zofukupujipibemadato.pdf
    • http://stensoproject.com/userfiles/files/sisoledavumozad.pdf
    • 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_off0000ba1f.bin
cc62906e1652f8428f20d2890bf1e4ea8fb759758f3a46b23a3339b471d90f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1F 16220 bytes
font_01_sfnt_off0000e3a0.bin
9c9ef785cc4e48b0328cc09c464e44f2d5adfd68e87ca273279973eef6034b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 10684 bytes
font_02_sfnt_off0000fc1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 16792 bytes

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