Malicious PDF — malware analysis report

Static analysis result for SHA-256 36362bb3d0b72c5c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 16:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6132d4c6e4a676d37e97f27f8296be46 SHA-1: 7c7f837e579355bbd704fb6f4a96a6a137bdca48 SHA-256: 36362bb3d0b72c5c5bdf5aaa9ffd78573ccfb5e1507611b96b26e2886bd67977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a first stage in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://wastran.ru/uplcv?utm_term=anime+go+apk PDF link annotation
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/93338947107.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/93545467669.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/75564103920.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/9894620319.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/74180107692.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/44100853238.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219121637526768.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/nekejetixowenefakifa.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/19113666389.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/55274675840.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xorerewizazegewajuteja.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/zizogerofuma.pdfIn PDF document text
    • http://ladna.pl/user_images/file/2660221543.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/25156756192.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/46943590004.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/32633730868.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/milalexazasa.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/14614019073.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/fovupisoriwawerawob.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/befafalo.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109011836257500.pdfIn PDF document text
    • http://orem.mn/uploads/files/6630021333.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139f66c5c722---55370232325.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/87447495259.pdfIn PDF document text
    • http://dakmet.pl/upload/wogozufimuviledep.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38339230343.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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 17636 bytes
SHA-256: 441203962b2b193b4c901cc28a570368506c775509df90e5d5f81ee79957517e
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 10256 bytes
SHA-256: 9b2329f68f99b766a1cd7aa7eb8945e3ac6661097b9a880a04f2c008ece40e49