Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a4787013a3070a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 20:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a02f7f504d54e0950bb4f3b79f946c2d SHA-1: 9ea50ff2b51763325e46387e35641dc197a6d77d SHA-256: 99a4787013a3070a3b9482f129f27c115cf0723931c6fafaf4615be3fab90003
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous external URLs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content are indicative of an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=video+to+mp3+cutter+apk PDF link annotation
    • http://vaynhe.com/upload/files/mefikazopenigijofafiwusin.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/danuvivimugobatonamu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/15795092515.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/14917943815.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/62872103213.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d7a613052c67bde575743fe2ab223f19/morekus.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/nonasadajazenepekamo.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/72882496504.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/sokaberujedigaxuwiredazi.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/sukobesilajutiramopefedop.pdfIn PDF document text
    • http://sns.hu/_user/file/59056256963.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/xulojadanexalapirejadixo.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/mudobusuwujupebonax.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/mepojijesebeminomurin.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/xigabilotumuritijipeladux.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/12698480703.pdfIn PDF document text
    • http://miminku2.com/contents/files/10919833893.pdfIn PDF document text
    • http://ingore.cn/upload/files/mowiwupimolojomigogam.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/501105564614782b27742e.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/devodilukalereruz.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/95842707625.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614be1eea2eca---kuxobowepi.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/21500349918.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_off0000b49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 17324 bytes
SHA-256: 24fbd30c01df898d6897f6690422df5676b7c938f42aeda48ff48bc235454106
font_02_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10692 bytes
SHA-256: dd1942c59d69be29cbce39f6567ff103da68195534c32749396bb6548f020061

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