Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1710fa5b8975efe…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 05:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5773fbbf94f0b290d2c26c5eff7a01b5 SHA-1: de1000d76e43bb59ddc5e695f1213ae5a34f2b59 SHA-256: f1710fa5b8975efee684408968cf55eb8d912c2db1c985a7c2e8d9d137348e4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and a machine learning classifier. It contains embedded JavaScript and a large number of external URIs pointing to various domains, many of which appear to be disposable or part of a link farm. This suggests the PDF is intended to lure users into clicking links that lead to phishing sites or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/30665056043.pdf In PDF document text
    • http://fratellilongoni.com/userfiles/files/nokitokafokuzavov.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/pomowikofiferifebujumelas.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/7757202160.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/50097604045.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/75470518579.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/47819495895.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/12311103022.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/16087539922.pdfIn PDF document text
    • http://aurora-c.jp/files/files/3360142885.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/28023735914.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/77894753560.pdfIn PDF document text
    • http://consade.com/userfiles/file/marolefo.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/65161365673.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/60015831562.pdfIn PDF document text
    • http://pololanna.com/user_img/files/jomugimimuva.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/78860390652.pdfIn PDF document text
    • http://eventechsite.com/files/files/jinelopobodoz.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/70981639625.pdfIn PDF document text
    • http://charivne.info/images/file/37966060160.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/10281592983.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/nanufofagatewife.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210920190531.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/363401077b4e6c7f169f6f9e14ee11fd/biludomubugolirufelitumok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=streaming+seven+deadly+sins+season+2PDF 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_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 18764 bytes
SHA-256: 8427e4d6bb1e2c341808e270033b73c742de41b3750cc4e4ccd6625658a2c478
font_01_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 10968 bytes
SHA-256: d080ff7c943f17715a2156e157c03120f2d9e4fbcb60e4d7578900ec611a0208

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