Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2f703e91282816…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 22:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c2b98b12cfbcd08ac795d51a421cf64 SHA-1: 37193729c8c297dffc4e159f72032a0502b65ec6 SHA-256: 7f2f703e91282816956d4d374522095b42871dd85bb90962b6eb92c7b04700ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=choose+best+haircut+your+face+online PDF link annotation
    • http://luxcottage.ru/stroykamen/userfiles/file/fusori.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed52058a54---84080759773.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/mawarofetum.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/95375522044.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44754874015.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/23068383035.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/ninotumidi.pdfIn PDF document text
    • https://majubesar.net/contents/files/86383964333.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pojeserova.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/vujeridewoxelam.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nagomaxasegebewofosoti.pdfIn PDF document text
    • https://unaizahic.com/Files/files/84153104468.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/24315683617.pdfIn PDF document text
    • http://go-forum.cn/upload/files/direzixanasop.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/50000498526.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137658b4c185---29332137306.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/39155355162.pdfIn PDF document text
    • https://medpressa.ru/files/file/merenasidotapixisidewuzo.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/keritemilan.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/refanulasuxibepiruti.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_165628_143.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/94714308769.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/gugerimatamup.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/motamuvi.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/86044147447.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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 17812 bytes
SHA-256: dfab9ea88806adb0fb3085af9e68e9d7f1d6842cf4df57ef974d8f673f9a9a71
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 10820 bytes
SHA-256: bcd9ca1a4517644811fd9ab11a54a7a967021c10781914a54fe4b8a825311bac

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