Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6c40c071206602…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 01:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 661c9487181e860956ff6afb5ea1aab8 SHA-1: a84a1c4847d5777b9a9f41528b6ffe998a5c96b1 SHA-256: fb6c40c0712066026e7f7235fc1db5c9376294e2ca08df31ee53c677405ea9fe
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of numerous external URIs, including one identified as a link farm, suggests an attempt to redirect the user to a malicious site. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://alatasfilms.gr/ILC/img/file/xazozenamovetemipeses.pdf In PDF document text
    • https://derfo.info/resimler/files/sowekafosesedipuwegofovef.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/vasujusenuxanuwaxa.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/suxedurazutuxipizidujuzi.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/zozise.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/48141135816.pdfIn PDF document text
    • https://kimcert.org/E/file/balifegilufikazube.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/genuku.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7b153b678fc4e97bfa2fa494813a9485/mixonofigifagomata.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/88628821516.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210921_746E98BDF4E39120.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/jematakanifipi.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/vabetadesesototago.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33480994046.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/fujidelibutogito.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/57364420763.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/53721861438.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/80061527903.pdfIn PDF document text
    • https://rajaunited.com/contents/files/wuwematox.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/mavoputevotofukibamisur.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/13167548670.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74146951295.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/vixajolisivobogekepipafun.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/37418140215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+game+builderPDF 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_off0000b02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02D 14388 bytes
SHA-256: 7b9175313e8ae37c976a58ade90069ea411334c1cabb7a62fb32af08aca6213a
font_01_sfnt_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 10544 bytes
SHA-256: 7868a9e949bb270d27c6f344d300ba196d4ac8f9681390056319843e39605477
font_02_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1