Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecb6b1fcbe5bf88…

MALICIOUS

PDF

93.3 KB Created: 2021-09-14 18:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 100d11c1eef8c940fce00cb6b72e799f SHA-1: 48673e9343c27ab17f6a55e84b4bd95027b734ff SHA-256: 8ecb6b1fcbe5bf88fc7495340e5c253817b0413a8a69617a0675ddddf0849b44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://k1a.ru/images/files/file/87456609087.pdf In PDF document text
    • http://gulfcoastlist.com/userfiles/file/labebat.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/gakonadevaguxoj.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/62043227351.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/23269110551.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/38925102904.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f27712353---gijalifake.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/wozigusuna.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6277ab6451d720f9a669f91764d41baf/47869007059.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210905151657.pdfIn PDF document text
    • http://a899.net/userfiles/file/suzuvaz.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/52770408690.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/piminakijok.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/41973540707.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/95875738906.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/gezosubesupe.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///basizawikumupajejuruveg.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/12199455034.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/zazulutifo.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/niwegumu.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/62594789462.pdfIn PDF document text
    • http://okun.su/upload/file/76426283216.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zixaluwegisapumokixizuwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=a+room+of+one%27s+own+virginia+woolf+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_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 18812 bytes
SHA-256: afd977753d2d8cffb85304375c55889ecc9e441b1bdcb449d899d1b4410110a5
font_01_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 10908 bytes
SHA-256: 36006c5f7b28bb21e70ed6a34eb7d204140bff66e61612f0fdb33c70534f7946
font_02_sfnt_off00014f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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