Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f6fdaa65cde641…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 11:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0cc944c240168a1d7bc73f7d0e1b17b4 SHA-1: 6e9c532b56c0e9bb68f798824bc0dec287fae4b9 SHA-256: 66f6fdaa65cde641c8ff37642ccee2bb599d0ab8d336964ed235cb52070f3cc8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to different hosts, suggesting a link farm or redirection mechanism. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to the embedded JavaScript's potential to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://szentistvanpatika.hu/upload/file/14373408435.pdf In PDF document text
    • https://aventura-agence.lu/userfiles/files/40194182759.pdfIn PDF document text
    • http://grimastone.ru/files/pijewujasad.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/63330149923.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/51922013410.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/89293972040.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/43813487825.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/2696973336.pdfIn PDF document text
    • http://fpole.ru/sadm_files/16005892238.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/35299239146.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7009c134951d2683ba1cd2a046b37905/6447200942.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210908040820.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/36062118032.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/69267368498.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/gowolisiromataxigaso.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/69671370733.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138590138868---gexabojubivuro.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/buvebolezutut.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/kozerilorotal.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/dekone.pdfIn PDF document text
    • https://es88.tw/pro_pic/files/pifebix.pdfIn PDF document text
    • http://poorclarescork.ie/images/77419710269.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/titejolofedudixaxijuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+tips+app+androidPDF 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_off0000b0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 15296 bytes
SHA-256: d9ccad29e2400d58fd31a72326fe1c396a4c780051879a30654ffc062beb7990
font_02_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10304 bytes
SHA-256: 51992e4003ca1489af2443ca0e735cc1ab59b1ea6a381b0b4937d5121a490c04

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