Malicious PDF — malware analysis report

Static analysis result for SHA-256 adce8b4c0c186b88…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 10:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe80703cf771f5ccc0dc5b8dc8146887 SHA-1: 0425f593d2b0d9bb8c3efd3bf809a8a3ce239834 SHA-256: adce8b4c0c186b88e982882999d46b574f7e9e1c80628452891c7962a703dbde
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://arte-salon.ru/upload_picture/30678338485.pdf In PDF document text
    • https://futurefacesmiami.com/uploads/file/63306966518.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/fatulozeniwazidodetiva.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/bavalewusuw.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/xasupevilasorodibozefasuw.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/98638359523.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/jipid.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/jovenido.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/50540624391.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/kuratovuk.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/4669596814.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/28887298616.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/zuzufabare.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/34889725620.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/wanevafabilumutoxalexabe.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/188189203.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xokodidigew.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/rosovefidawag.pdfIn PDF document text
    • http://intertribo.sk/files/66556263271.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/55860210780.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fixetekabu.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/lofifi.pdfIn PDF document text
    • https://cardolf.ro/files/xudimeralep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+vr+video+on+androidPDF 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_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 10428 bytes
SHA-256: 2fd2df0efaa425b9aafa3add8a4e0c3065f2aa1e400a5bed128b22a3d58394a1
font_02_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 16504 bytes
SHA-256: 4d4b94ef651ad3c088c1ad24d801bbb3c2b7275d4975e24949ba04e0b6850d91

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