Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ec55192e98c4c0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-22 11:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e9755f0170f3991f1f0b0466a6a7398 SHA-1: 60c3f6c9c3f0d44f09fb93d233057e3bb9eb200d SHA-256: c8ec55192e98c4c0470927215fc4b7dfbff8f0dfdf6e899eb705d98ef65e52f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs point to external sites, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not explicitly detailed, is common in malicious PDFs for executing exploits or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://catamma.ru/uplcv?utm_term=samsung+galaxy+s20+vs+iphone PDF link annotation
    • http://ekonopuntos.com/campannas/file/viwililapogabixa.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/diwidogu.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/niburobuzagujatagutezu.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/98449482882.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092021344163.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/94903112341.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/94093361663.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/29154020044.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/wesadavu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/migapiraduko.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/32490908967.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c6dac0a1e6a3a8581416230502a78dfa/lugemetoxij.pdfIn PDF document text
    • http://cwesp.biz/upload/file/43600118689.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614895ee47684---61163819691.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/17498241799.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/vapegamadudadupejub.pdfIn PDF document text
    • http://mosjob.ru/images/file/10180244936.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tapufegivatikovex.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/33619349969.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/59869387146.pdfIn PDF document text
    • http://weingut-suppan.at/files/71863973520.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/nugewefixosaraduno.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/wowenokoxisekawukibi.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/vepapuvojowijujawoter.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/vijagujefukanujodasusu.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_off0000c84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84F 17348 bytes
SHA-256: cbe432c8dc7abb6f39f376bb01a93ef5433d6dde9f2a54b9574c6362a35d5b8e
font_01_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 11200 bytes
SHA-256: efc50d3fe0524a2de94e55560c86e9ce8e0bfcd8de1d8378e2f7763d432095e7