Malicious PDF — malware analysis report

Static analysis result for SHA-256 72516102c664328e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 06:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4acd22f7a273d19b5b1bcea8cb77f66 SHA-1: d6d2d11c2cd8b62b2f9ce4086b479eb0d561d3a9 SHA-256: 72516102c664328e964347c7398dd05f8d6215369dd14baa6741bdf65881c1fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware by posing as a game download. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://egc.ecrom.work/syo/files/44153484794.pdf In PDF document text
    • http://kompassztuki.pl/Image/files/vagixidasimogazomerus.pdfIn PDF document text
    • https://sambelteri.com/contents/files/58716167605.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/86829270603.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/20407019139.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/23949001768.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/piwit.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/32749096246.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/59805018143.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/13014497917.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/47751143717.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a85cb199---48489708736.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/rokoben.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/xulod.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/zepaverupago.pdfIn PDF document text
    • http://digifast.cz/userfiles/22627359763.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/76658527193.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/woxata.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021913241338693.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///63351789928.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/wetorevopekefakogas.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/7438202380.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/wojobadoxaputiki.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4bc994d6---61849298662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gta+vc+free+download+for+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_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 10492 bytes
SHA-256: f73dd130336266e5d13f981c00440a1e1747e1f42ca6565a66bcb01a69eddda2
font_02_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 20324 bytes
SHA-256: 949e0a86e83a61d33278bbb9f725b4a569fff167638a898040b83415c952f045

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