Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d09fb5a7326b562…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 03:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 393cff8e8690bb190ae9331edd993910 SHA-1: 34089315b19d17dad2cf5c926f7dba309699ff77 SHA-256: 5d09fb5a7326b56220db6ee7640e1c7382463bbe2f39264d224f4779fff8a2da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identifies it as a link farm designed to redirect users. The presence of external URIs and the link farm characteristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+block+notifications+in+android PDF link annotation
    • http://nontaromclinic.com/ckfinder/userfiles/files/7617721818.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909083230.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/41960009756.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/25328239588.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/28454652777.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/22765472735.pdfIn PDF document text
    • http://vit-physio.de/file/danaxotaza.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fesaten.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090217082456.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/91957166061.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/23037056760.pdfIn PDF document text
    • https://iword.de/userfiles/file/12004966512.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/1878551136.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/gimir.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/xosutuk.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161347f4d9cf35---larunozibexesawegeka.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/raduvuxiwovukaxowozo.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/nikeduguwepetoruw.pdfIn PDF document text
    • http://spiregene.com/image/files/20210906_232240.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/31816246286.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327f435a810---pivetowovelixapilapipum.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sivaxaj.pdfIn PDF document text
    • https://filetorme.com/upload/files/fojubuwamotitulive.pdfIn PDF document text
    • http://honghuibio.com/d/files/rabaregobanisawus.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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10644 bytes
SHA-256: cc7bae67fd1026eee4e930c01a0f9d8e4ced2a3612ec0fd3bae5d1d29be6e065
font_02_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 18200 bytes
SHA-256: eef79331eba3a42b8ffe97e46e3ba0c54bfc5ce01800ff655acca0bba6e7c74b

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