Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84a3176dbb59425…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 19:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0c75bc4822afc23283bb9608431357f SHA-1: e6201bd89778a15bbba043b337ec2affb03e0db8 SHA-256: d84a3176dbb59425135eb60c761f6139990aabb381d6d89f1796aeafaa12a673
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest this file is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=contacten+verwijderen+android PDF link annotation
    • http://windmill-bv.com/userfiles/files/vixoxejefog.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/jesadamiludadosupu.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/napuwepamap.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bofupatelopubiseluluwaje.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/050919049128.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe31bce97---dojilikejamu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/16190624683.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/jajinokeluzoz.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wuromujovilinalisiroseba.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/77268518127.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/gowegavafisesumu.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/vewofipiwuxaradobavevil.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/xunawimuma.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/pigibomekevukexuvonot.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/52427309928.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/nasapaxoni.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/puvukowu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cc1a835bf3d394b32d799f0194faa36c/jaxuwewomabesipa.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/91269649798.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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 16644 bytes
SHA-256: 84183401b01087ad4c744e8a1ff9dba1f51c3dfe9576d5ae5b7328aeeb2743a0
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10460 bytes
SHA-256: d761ba4ba9390f0d9a051ee49a77179752f09dc9902ddb5709a00829898c6459

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