Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6306b840352e16a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-12 18:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ad6e3d8376fdf8eb3c937a1e13574f3 SHA-1: 88711a1f341b7c27364b881a8bafd531fcabe73c SHA-256: d6306b840352e16a3666a587bce3e92e19140263a7548aa0fd8c49e7925d5cbb
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. Heuristics indicate this JavaScript is used to redirect to a link farm, which hosts multiple other PDFs. This suggests a phishing or malware distribution campaign, with the initial PDF acting as a lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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 http://ageddfjtjgrade.pretty-match.com/upload/files/83323678469.pdf In PDF document text
    • http://marchmontnews.com/imgs/file/14101959911.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/14322968046.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/60264609510.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/vedipixoziva.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///84666659159.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/50940284312.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912231858.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xosopus.pdfIn PDF document text
    • https://baglab.pl/galeria/file/31432620465.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/milos.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d12652a31---72495289292.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/91606659923.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/10125401733.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/98221764386.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/77765827256.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/jotuwodonadutaka.pdfIn PDF document text
    • http://inercial.es/uploads/files/kusabaleradomixexo.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/winiwosawobafozepopub.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/zaziramogazuzinowinago.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/41707038000.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/11413590530.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/44007548137.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/98329bbbc2fca94028c3a0a799d93337/lutifafifikapitabifowigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=net+err_file_not_found+file+android_asset+www+index+htmlPDF 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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 15128 bytes
SHA-256: 4af82d670dc8a8aaf0d09c868d597ba92da8ee95a7d94af31a3cdca96f3a5080
font_01_sfnt_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 10916 bytes
SHA-256: 9902c47eef9510ea0955a4a7c3291e1f372df1196f04587801e6250f5dee0e89
font_02_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1