Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71f1c1d71e09352…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 12:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0520f0ab20dbb08d6ab679a3e1498bc9 SHA-1: 30e241305168c9787573b775250831f38969a2b7 SHA-256: b71f1c1d71e0935287a350f30bb3a6c2af2c39589e95565c8b3c4dd4ba033a36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to host PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and heuristics point to a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://drxzhang.com/userfiles/file/38428566698.pdf
    • http://kmbb.at/userfiles/file/16293915053.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_205548.pdf
    • https://indolabtek.com/Uploads/userfiles/files/9691297504.pdf
    • http://akcompany.vn/uploads/userfiles/file/36757693479.pdf
    • http://trumoi-khutrung.com/upload/files/82958170845.pdf
    • https://buddhaart.in/userfiles/file/zopejezifabotisataki.pdf
    • http://studiofelician.com/userfiles/files/54468616679.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/xowil.pdf
    • https://apsco.ly/userfiles/files/tupizafuv.pdf
    • http://www.rajpuc.pl/pics/file/34804676825.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/99938846264.pdf
    • http://artsar.pl/userfiles/file/8329937415.pdf
    • https://gemwares.com/userfiles/file/bozinowaxobovubijunuf.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ec202d69---gatolopojewapovekiberosa.pdf
    • https://marblo.ph/app/webroot/img/files/rokawumol.pdf
    • http://tythb.cn/uploadfile/files/serexowogemexosomakali.pdf
    • http://mextro.de/upload/files/buzijanuporubigajogag.pdf
    • http://ergakiland.ru/files/files/satajososezizeregel.pdf
    • https://pr-dienst.ch/file/gofipopimewuwozo.pdf
    • http://geredekombiservisi.com/userfiles/file/21982924642.pdf
    • http://mc-opony.pl/files/file/morenejifabofabezukikewox.pdf
    • https://mumegram.com/userfiles/file/duvozob.pdf
    • http://xinge168.com/uploads/files/20210905135533_431823.pdf
    • http://timnhanhonline.net/upload/files/kiwoxikiwogufuvovawizedap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=good+grammar+book+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_off0000e51a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 16792 bytes
font_01_sfnt_off0000fd2c.bin
aa483702333c8a465e23efbdea9df94b8ab5c06d69598e96e5613f4ae3971898		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 18164 bytes
font_02_sfnt_off00012c24.bin
5723d0facba6b3582449bea8386cf6c4742202f757821ec630a13806363cb86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10472 bytes

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