Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eff5499af59c137…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 07:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a284345c47416368b554148774b1e7f5 SHA-1: 673fda0f75ffec792c7ac044b0cce946b078047e SHA-256: 5eff5499af59c137b0383011b0b4eb5cd58e108bf7f3245eba71d68b00af0150
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and configured to redirect, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://mega.kz/media/upload/files/roxotofavaxiwi.pdf In PDF document text
    • https://annekienlen.fr/imagesfile/88180864912.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/73344974531.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110944497928.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/wizaz.pdfIn PDF document text
    • https://ccskin.com/geektic/files/50965233416.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/46789211106.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/57272270340.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xilapesanesikuv.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/bejusimafowuworuwolopet.pdfIn PDF document text
    • http://netflor.pl/upload/File/bujogixuzozikupalageli.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/pesaxoduribozuboraxobamup.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2ddcb92a---dolikarawuxata.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/19409012555.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/xinapujadidenakewi.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/63176078364.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/69495649498.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/40074723951.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/xozopadisaxevi.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904040115.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/vuvunemiwupuvuzufenizuzoj.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109010515211003.pdfIn PDF document text
    • http://simonide.org/userfiles/file/15177098179.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jejax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rate+of+change+in+tablePDF 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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 10532 bytes
SHA-256: 56b180aa6b1a5a030bf0caa1b7ea899b4934a019b23cd63b36b717aab56cb33c
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 18812 bytes
SHA-256: 4de7cfb39835d0da401b6c7026671eb3f8dede69739b1c8fc5c556a38233af6a
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1