Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bebf81367f20f0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 02:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14013c6766e0b89fa2dd13fe877f23b6 SHA-1: eb38961c9e3a0157f7ec68c346c075c25cae4b62 SHA-256: d1bebf81367f20f04aff6a54e1b18b06b3e555f7df8cbe48607ee40c012bf0b9
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=easiest+way+to+transfer+contacts+from+android+to+iphone PDF link annotation
    • http://alphasigmaoverseas.com/userfiles/file/tarekafikomunonizisetefeg.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/puguxojotuvotid.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/daleregemis.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/74709080361.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dn11af9rknd8n1ktgirhffldaj/52963456491.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a19ecd4b11---kajazeke.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/vakodozobalowawob.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/lewidifapuninulixot.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/vomerijovidogujimawubinem.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/99167725403.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/79620863139.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021923936244173.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/25511981650.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904130909_523459965.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/2954792600.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/66533233771.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/dokiwiz.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/gikosilolazu.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/gosuvof.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109050957422338.pdfIn PDF document text
    • http://gibisch.com/files/files/58485952195.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/53142117355.pdfIn PDF document text
    • https://taperagi.com/contents/files/makarigowodafamolefewezon.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/basakimubemeso.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_off0000b595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA7 17564 bytes
SHA-256: 5c024777e43375e5d483ddd7e12d7c7906c64d84256f29ab9a7cc8167fa5c0dc
font_02_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 11020 bytes
SHA-256: 25f53a42d4a5d7572be2ef53df2feb43fd607bc764279dc21d27cf44e73dc07d

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