Malicious PDF — malware analysis report

Static analysis result for SHA-256 107434a8f23921f7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 10:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e08b32ea54c496eac10f421da26e8ca3 SHA-1: 261752f7534432ba9ffc1eb605cd6cc80500519a SHA-256: 107434a8f23921f7d8eb3d3ce16ceff8007a58960187b2b48f35aad22768ecd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links to disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tecksco.com/upload/files/92550780700.pdf In PDF document text
    • http://htwy.com/upload/file/5528669232.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/21753145439.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471f202948c---laxezuvegigoxuganujuro.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/11911057572.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/lumulate.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/jigelogemolubonaze.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/54211342445.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/popeneputemudaropa.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/18003868421.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/72288188010.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/fojidejidavasuninad.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/fufoni.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631274003.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/vamuba.pdfIn PDF document text
    • https://salonrewards.ca/images/file/90145184149.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/seridipasizelijife.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jenogunot.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/35157077186.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/85908396157.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/lijedabikonufijosuve.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/milifajowe.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/66419885950.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903034734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tom+brady+diet+book+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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10652 bytes
SHA-256: 45106ca272fe8c4aec9dfe6471b46675d1821ff37e8dce034bef11438401a463
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 17948 bytes
SHA-256: a426dd3510ecbcd14d3fd170c354b1528d12a13483ef38338fa600bdcd1802f8

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