Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8e638e966e43f0…

MALICIOUS

PDF

93.5 KB Created: 2021-09-17 15:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b90d420c35e199ccbdcdf34163e1b15 SHA-1: 01d03600b795a9e74fc8fc1d00e1cc9395aad8dd SHA-256: 7b8e638e966e43f0724180379ceece9cebcc31ddb54f5ee365f6dfcd1057279d
134 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and numerous external URIs. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download and execute a second-stage payload. The numerous external URLs, many appearing to be link farms, indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=temple+run+unblocked+76 PDF link annotation
    • http://quaretti.it/userfiles/files/dixekona.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/93490623997.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac34c8f1b4---95831837638.pdfIn PDF document text
    • http://uchid.com/uploads/file/13248281376.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/34172830694.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/fitopanisajovuwakum.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/72141171069.pdfIn PDF document text
    • http://belean.pl/userfiles/file/39819019787.pdfIn PDF document text
    • https://kultmotor.hu/images/files/nodesupobu.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/92269526928.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/jevadimojasok.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/86422504607.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/77815bbd94ca62060cc8149608a2af54/59506228048.pdfIn PDF document text
    • http://zeci.nl/im/image/kivopamabimu.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/nefutakavexeniwer.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/3641464512.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/busexixowotilibu.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/jekaxugarem.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/81669064697.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/86525799136.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/gofudoweduxelaweg.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/zokum.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/68694399552.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/30471793082.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_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 18648 bytes
SHA-256: e22dcf874ad66e4e0e705c035bfa2cf082e043bd4d1dedd778be12ea59a114de
font_02_sfnt_off00014fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEF 10668 bytes
SHA-256: bc61066a912ec2054673cf26c91b5b6ebb09a46d8450c1e4eeb81b2e763f42a7