Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01376ca22d80c5e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 09:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0b94c9887711abdeb134188e189fe03f SHA-1: e837138edd339ea507743c7d84aa1dd4b004da92 SHA-256: a01376ca22d80c5e1ec4663da50c20e9ab549a487a066e2828e6f65168ada857
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it is a PDF with random and disposable URLs. The presence of numerous links to external sites, many on potentially untrusted domains, strongly suggests a phishing or spam campaign. No scripts were extracted, but the overall structure points to a malicious PDF designed to lure users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://istanbularicilikfestivali.com/upload/ckfinder/files/6844003396.pdf In PDF document text
    • https://rizecanreklam.com/images/file/xotejotapizadobolumopejex.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/geramunanavibe.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/34506738738.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/43876188336.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/pefatulawu.pdfIn PDF document text
    • https://petala.gr/userfiles/file/livarijipazeko.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910030602.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/48098395305.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/86510461811.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/5983536695.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/4578764325.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/90802918556.pdfIn PDF document text
    • http://hrudolf.com/userfiles/nesijut.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/32493977320.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/10606390247.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37257b437---60521962410.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/sijirusobesebur.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/53200135016.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/kojorakizesutetata.pdfIn PDF document text
    • http://liily.jp/upload/file/20210902081432.pdfIn PDF document text
    • http://origo.ws/userfiles/file/170518736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=word+file+editor+for+androidPDF 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_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 10172 bytes
SHA-256: 04a1abb4c323e064e2f2154e8fd75be95e0332988b03830d75bd3f3bdef0d909
font_02_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 17200 bytes
SHA-256: b6cee6bac60b7f781bcc92485ee63c6e649e1fcfee191c0157eec06dee4788a6