Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f2f14a84dc7a53…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 23:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e1e0c85358aa23bf35e108f35f1e8ae SHA-1: 85f5ea9c1e0a10fde640ef871098625d03fa9869 SHA-256: a7f2f14a84dc7a53eb2f54783af5db4b1eaaebb5aa7a2733e11b3b45f2a3b655
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+do+you+cast+a+video+from+your+phone+to+your+tv PDF link annotation
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba1b0f2fc---dikezenanovibo.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/sebetupatuvemusojudo.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/52688551579.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/74699493146.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/bixifixewijadopan.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613367d57e55e---52320552160.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/8865827227.pdfIn PDF document text
    • https://ka-base.no/images_content/file/wituvawaga.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/puselus.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/9183509138.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vodamurumolinofosetaligi.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/73772433487.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/zebejutinuwamovunazovuka.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/75062533925.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/difudeletujivewarop.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/63338203495.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/valuzowebo.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/vinunanebadikedipabukakem.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/74133564183.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/46560197434.pdfIn PDF document text
    • https://clickbox.ro/images/file/856655122.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/23135857889.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/begaragitofim.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/lisafowararop.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/bevinajinenufitalij.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_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 11196 bytes
SHA-256: b5ab98b52169da1a301f82e01da79b777d5ec60ed189873774bdd6fd731f08a8
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 18412 bytes
SHA-256: 16ebce020eecb1ebcfeb5fdc6860a62317d24845ad91e032fca3bd4d5da3ad59