Malicious PDF — malware analysis report

Static analysis result for SHA-256 418558dd7192a4f7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 21:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3deafa38dba2dedeb1cbc3ac552cf076 SHA-1: de1bf66833e4477dc7eede68fde7d0fcf8733762 SHA-256: 418558dd7192a4f7d21a3289fd78e54039557bdbe2e015c48aa3b45e4184b67b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable domains, suggesting an attempt to obscure the true malicious destination or to create a large, unmanageable link farm. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lodoshosting.com/calisma2/files/uploads/sutujogaguvuvasevumufuxo.pdf In PDF document text
    • http://apvn.info/userfiles/file/38146647568.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/sigetowunotepul.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2aca3deec---jawazarakofosumatapovi.pdfIn PDF document text
    • http://parateam.cz/file/jowozilog.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/sanaduxowumijebixof.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tixidawodidurejazigi.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/gewijolakafabalizewoza.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jilebum.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/wegukogulibes.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/25195707482.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/zabufon.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/fazexedowonulogolo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55062183155.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zetirotupozozomokoz.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/64747220846.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/sijukutitejejosafi.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/55194954993.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/wopesukuvobubitopawasup.pdfIn PDF document text
    • https://securitydm.com/slicice/file/25803665216.pdfIn PDF document text
    • http://badgerhillfarm.uk/jisilevisugef.pdfIn PDF document text
    • http://ccshecea.org/upload/files/17243324036.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/rigejufow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hillbilly+elegy+pdfPDF 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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 18460 bytes
SHA-256: 2a95443132632b3bf2afd8c68dd68597620d645bef7ab1327f426274da9be825
font_01_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 10168 bytes
SHA-256: a2562c8ad1193231abafab0c20b5dfe81d566cfcce711d9f9c5397495f259d89
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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