Malicious PDF — malware analysis report

Static analysis result for SHA-256 2609d831008c43de…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 22:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7b14e1af2df4d5e4d8638c23b9a5880e SHA-1: 7bfea98c80b5f31c2d91742321fd727958542c6a SHA-256: 2609d831008c43debb9c72a04807987c3fc605eea89b4bd838364cb5d4fb710b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable hosting and utilize UTM parameters, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://oniceh.ru/uplcv?utm_term=max+payne+1+apk+download PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161307c83a7bdd---raloboxopekewowora.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/xofenusilotovu.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/97467361349.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_01B0A5740CBEE80B.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/jifexorovuz.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/xidixibuzelol.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/32054716278.pdfIn PDF document text
    • http://plise.org/userfiles/file/84515933574.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/jojevotud.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/23606283152.pdfIn PDF document text
    • https://go2germany.ru/files/file/8240017822.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/sefifi.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/28109571166.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/tirubexev.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/16383692091.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/navejunededifosurapefozu.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/97320844592.pdfIn PDF document text
    • http://balone.net/_upload/file///vadulagewitonores.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090323241273499.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc93b18ce---jugirumu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35656913911.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jotogex.pdfIn PDF document text
    • 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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10364 bytes
SHA-256: d2714e74c8b98b8d2d0bea832342cb4b6e2dd711ab5813c5734b2e16e4f75652
font_02_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 17856 bytes
SHA-256: 1443709e314f6cbfd46609f2b213cba54045b07cc53e524436ba755f333bb324

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