Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f8b34d2784e062…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 01:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f4a1de6bad9082a733a9ee7a3551df3 SHA-1: 051fd7ac4ab44bc58c59c8ac97b2449cd2256e01 SHA-256: f2f8b34d2784e062593b593222126bcb76735e9ab1fce94179ea3a04faf4159e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://dieta-plus.pl/userfiles/file/45210289610.pdf In PDF document text
    • https://berettyotv.hu/userfiles/files/jobubitozalezividomatik.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/84564948316.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/mojojanofosufijulel.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/fubiganamejuped.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/33649083367.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-19/20210919015531306919.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/benulodenusalubunepawup.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/sodatuvakupuputene.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4d34a9e4---sapaxaxaxukogexejab.pdfIn PDF document text
    • http://opsir.eu/files/file/fogomobaluxi.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109181606008444.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/juzasupigiwo.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/makubuveka.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210918052219.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/zokemeb.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/getekifuliworanuzaf.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/39759430918.pdfIn PDF document text
    • http://labsshop.com/d/files/51935239772.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/18420214569.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/pogatuligusovalenuzoxamul.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/44487268854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mobdro+amazon+fire+stickPDF 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_off0000b586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 10876 bytes
SHA-256: 098bcfe928dbaa7e639acb0aa992205ab35aef1da1e57c59a63ba84c66ed1158
font_02_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 15816 bytes
SHA-256: 3dfcf87f5de9474a26de216dfa58c553979cc1a1cf4780add4b687402644f9f0

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