Malicious PDF — malware analysis report

Static analysis result for SHA-256 5148c835c6ce42d4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 18:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5fc11e6daab7ea4500778b5de76b8b98 SHA-1: a4f3a5d9599f746df1a07863e5304a6eb84db17c SHA-256: 5148c835c6ce42d445bdf66ea325248acb6e59ff4851a0b6ca427f7f40334333
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ML and ClamAV detections. It is designed as an image-only lure, typical of phishing, with a click-outward action to redirect users to external URLs. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=123movies+watch+after+we+collided PDF link annotation
    • https://www.assofmt.org/ckfinder/userfiles/files/mizini.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/75652443866.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/2000380201.pdfIn PDF document text
    • http://riph.pl/userfiles/file/fefajinenixovetexed.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/vajapuz.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/wugurefok.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/kajadekug.pdfIn PDF document text
    • https://online-wums.com/files/files/lamoniva.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/55969018027.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/sitareto.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///pokuwulopu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161301b1d10787---40383991055.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/bigifoxidofuvonuzamiwe.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/38824745079.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/83827478634.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/99593439989.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/45913541152.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/davadoxiwe.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/sixapolakexapedoko.pdfIn PDF document text
    • http://sergeybazarov.ru/file/94180731571.pdfIn PDF document text
    • https://seerupit.dk/assens/file/41640769772.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/xuzorederabeneke.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2758d750cf5123496d4bec7d6ede55d3/51238646538.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_off0000b015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB015 14092 bytes
SHA-256: c6492aac1227bd1c6e487cb4a99cc919ec6ada23635702eb5b517ff11fbced57
font_01_sfnt_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 11036 bytes
SHA-256: 8c59063120ba4816ea68be25ccfc9b58862396992738fdfb7d891a99406e218d
font_02_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1