Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fe1116c8083f5b…

MALICIOUS

PDF

76.6 KB Created: 2021-02-27 05:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f711edbca6a25cde5871048fa1e9a877 SHA-1: 249aa5a241bb9027fe96f6390caf1b72e85ea148 SHA-256: 22fe1116c8083f5b85ca9bc59d789bd89104e1612f2262c11bc49588dba5b011
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF creation and search terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=java+software+structures+lewis+4th+edition+pdf PDF link annotation
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/9b63a054045a1.pdfIn PDF document text
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/4380454.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/3019678570.pdfIn PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/digozaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_60097c321ed5f.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/sikov-jakove-butefesameke.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/2362808.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/kilidatagawitisumodipe.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/bepomepeb_gipijeweguxotu_sugulo_wesikutilagav.pdfIn PDF document text
    • https://mojurakikaluno.weebly.com/uploads/1/3/1/4/131438245/mobasakare.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/gelatibugomow.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/33807662069.pdfIn PDF document text
    • https://jekowidemovo.weebly.com/uploads/1/3/4/7/134702183/8712932.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivojeda.atwebpages.com/jovos.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/dugezopovudi.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/monthly_management_accounts_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/gagowofakoja.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5472 bytes
SHA-256: 9e1c7b2f0df17c4d668dc6b5c00fc8e54f1b09237b23e9e64e910c10174896d4
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 12652 bytes
SHA-256: d604eb9f7f7fc99e68e4c79d406c9ae484ef11073ab1fa62a27ff3488b397162

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