Malicious PDF — malware analysis report

Static analysis result for SHA-256 304611a44462487a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 11:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f2bf599f6276ff788493da298a86cd3 SHA-1: e03fbe5150193aea50a281eb1451574ec72b4e66 SHA-256: 304611a44462487a4f285b5762c2c86a74bc3119a0b94d0b711ace3740921615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of many links suggests an attempt to redirect users or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://veiligheidssloten.nl/ckfinder/userfiles/files/tovirizapetugabizugexaji.pdf In PDF document text
    • http://akvatoria.by/UserFiles/files/lasarewizikudebiz.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/dugimajiranofifizaladabub.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/rutuziju.pdfIn PDF document text
    • http://jsdarvin.com/files/jikabiritiparogavirubek.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/89549399935.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/wivipoxemekitajon.pdfIn PDF document text
    • https://e-midas.ro/files/file/rudibodedezidilisutawadi.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/9906428341.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/3746503264.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/62108043639.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/66371815371.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/72100821476.pdfIn PDF document text
    • http://sun-eko.eu/files/file/xujoputetekagini.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132309a6ea65---60309516457.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nepewurinowo.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/45886628666.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/pakomozagexovemow.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/42655782938.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/33747197929.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/2239422304.pdfIn PDF document text
    • http://446888.top/userfiles/file/16144900677.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/jowesaxixibuduzufigiten.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/paxasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=extreme+car+driving+unlimited+money+apkPDF 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_off0000c14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14A 11144 bytes
SHA-256: b7cd5c1a2aa9d4c97092ceb2b841bddb2dac2e76945f89a4ad6f56b60ed4c0d4
font_01_sfnt_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 16556 bytes
SHA-256: 4ab967f4d529f920212f11599e0ae501e32f4be7a914b645d04b897d1ab0c83f
font_02_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1