Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0004251801e7e05…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 09:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c85b0343177874532990f15c6edde77 SHA-1: 8d49d3ec9399ca4746b6409c9c9995f7f3aae594 SHA-256: f0004251801e7e05aaaa9da3094d328d673b25ebf5c4b73355c282a629fe71f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a significant number pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=unlock+codes+for+android PDF link annotation
    • http://orthodoxvaidikasanghom.org/userfiles/file/84107200708.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/siwana.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/fawifop.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/xeporijotarexefot.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/firewojixa.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/nepetunovixisibuso.pdfIn PDF document text
    • http://unseretochter.ch/images/file/34124386608.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/39417350639.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210916140751_gc7zag.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/r7u8vnehmkmqlka66vm963sah4/56872221975.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wurogaguzobo.pdfIn PDF document text
    • http://wamer.org/userfiles/file/wajozamapasivobenurabevot.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/3416205209.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nifazarifufagepafikuwut.pdfIn PDF document text
    • https://businesslife.com/content/file/20651348913.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/bebami.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/vofugasanotamuxuzena.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/51579964685.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/bifujuvuriladurap.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/wowelapupefus.pdfIn PDF document text
    • https://tierlistei.ch/downloads/16920590775.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sifixupoxefivufijinex.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/nurebimufusofexulegalaja.pdfIn PDF document text
    • http://zeci.nl/im/image/36701830608.pdfIn PDF document text
    • http://anm-av.de/uploads/files/fufufopaze.pdfIn PDF document text
    • 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_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 10468 bytes
SHA-256: 5eae3588497481d8ded4e6d87362415588ffc3cfd87221bb743cb9cbb9bd4843
font_01_sfnt_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 17808 bytes
SHA-256: 47e4242fca75bd18da0677ffa4c74e67f685143ee76fef256d583f9a15f489bd
font_02_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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