Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb70ed7c55442c8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 14:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0693a5b3429175a6b2af367b8536254a SHA-1: 5e556da5b21170dd75bfa3e61f7379bcbfa0cdce SHA-256: fbb70ed7c55442c89d00b43e278038990aea585376b0b9757bb65174111b55e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms or redirectors, suggesting an intent to direct users to potentially harmful websites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=videotube+downloader+apk PDF link annotation
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/noduk.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/91680777449.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/22841426035.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/tesumomo.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/nugosiguwivepeluguko.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xezufevozowogeba.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/72605684230.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/widunej.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142582855ff1---rejamezivim.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/61202767613.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/04dd6ad910814eec00ac300480eed0ba/51429395695.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/lezunebazuvesijufizaxisep.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/lufopu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/12496956266.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_223115.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/luvipumabute.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/93350086920.pdfIn PDF document text
    • http://hanleyresources.com/images/82537150381.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/nufezibiz.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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10604 bytes
SHA-256: 9bc60a75bb9aeda57a926acc280d3e62be05b6e6c2ee3be3b8c7419da1400af9
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 18336 bytes
SHA-256: 97f7b995687fd6531710b7dd0d33676bb4f618283691c0404565db6dc12b5dd6

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