Malicious PDF — malware analysis report

Static analysis result for SHA-256 fece3203b8fb0ba8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 16:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 908c7595381e2813379cfa76d87ae203 SHA-1: e2852e863b7875fd24aa1cfccb5a41827a2cd536 SHA-256: fece3203b8fb0ba80a29e6873e7bf4a135fd93f4ad45bd6ab5c8dddf5c1204b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm strategy, likely for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://dursunguney.com/userfiles/files/12978422536.pdf In PDF document text
    • https://branpc.in/ckfinder/userfiles/files/bonulo.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/54529292142.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/68887214235.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/dopalor.pdfIn PDF document text
    • https://uangraja.com/contents/files/5516569273.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/88982931877.pdfIn PDF document text
    • http://kvrhousing.com/uploads/dukuwumibojaroni.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/ludowajokoxaxazanexar.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nevonoseg.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/87538915258.pdfIn PDF document text
    • http://olympusflights.com/files/files/zefusin.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/81257674251.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/86529363060.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/lonebo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/rodipejepanisekimoke.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/46705059285.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/lobozafekoluge.pdfIn PDF document text
    • https://stormester.no/files/file/37808003769.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/84290227665.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ihs2jghu88er6ltvm5jvnnu5h8/genivolulileberalig.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/legogo.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/58428526785.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/81328135089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+100+book+free+downloadPDF 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_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 10548 bytes
SHA-256: 82e2c2dbfa767b1655245f85c2de511c72448263d86e59f0dbcd59fab2525842
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 17480 bytes
SHA-256: ca4c6043b1c33c9c0a67997693d170d37ca817c370e383b290de36c713e2126a
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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