Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb80fbf153321137…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 03:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8198179440c77da58f00923b8346f6cd SHA-1: a38a789e424842f24551008705db9d5624a14135 SHA-256: bb80fbf153321137779a9a86d30be4fbad4dc9aa7f8e1977ca3d3c59b2a48a9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript points to potential exploitation or further malicious actions within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://it-hair.com/userfiles/bixamufimapakonig.pdf In PDF document text
    • http://gainliving.com/upload/editor/file/64570458883.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/67109424994.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/pitorewid.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/pamuzuzisesevarutamiweb.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/76560717258.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/bevolawebu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/patotiwojumitujakazulux.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/rudenu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161387c2be5d90---36834106633.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/61938374621.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/85202766561.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/zoxovopekemas.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/devevozakidogivaf.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/gawevaxetuxikexuxezezeden.pdfIn PDF document text
    • https://naves.cz/res/file/moxekifovisizaloja.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210901_4C5218DB0F45C687.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b1d1ed3517eb0995cd923c60e4da4544/gagulakavi.pdfIn PDF document text
    • http://whatdwellswithin.com/file/42921114221.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/95076408234.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/72150977188.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631145323_dde5c587a7.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_B74F731A270B9966.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/615581798.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/49134046197.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/95966840270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=turn+off+work+profilePDF 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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 10164 bytes
SHA-256: a5180573ab2a8e153cce14d6ab363d11c042e4fb05b80274ed43ff882588512c
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 17844 bytes
SHA-256: 4975fb079439b93683d9bae6764102febb9542f4e00cf6290836470c538738fa
font_02_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1