Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a778896cd504f3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 15:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e60404a5d21c6d37ec4ec5de4b17d54 SHA-1: c2bc2b01da0bf16f0f5c7ed258daf7669cb97caa SHA-256: 89a778896cd504f3a70f31f1d61af7d0f1c16e0e70c11c69e580f50715c967f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://systematix.pl/userfiles/file/jejuk.pdf In PDF document text
    • http://gesundimjob.at/images/content/files/31415922807.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/18188194189.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kivizisakijigusa.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/kafufezebed.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/soluxalonepafudosuxajipo.pdfIn PDF document text
    • http://afro-safari.com/upload/files/kojuzij.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/soxirusapexewusosedoposom.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210907062002.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3359c66c---rutewevojasawiwagirimo.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/33632278943.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/vagigof.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/61051429685.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/13738193937.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/ronopawuwifadiwu.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/53956214620.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/99141199304.pdfIn PDF document text
    • http://staropolski.net/Upload/file/85723793796.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/jixusisezegijo.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/pagezotisal.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/48341967273.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/40373959431.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/wukerumiwaxibuwuj.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/fenanapebofijewisaze.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/jigisogezuzugoxit.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/49544868093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=h9w+to+get+free+robuxPDF 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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 17544 bytes
SHA-256: 490c0608e12624b8b36b03a0548963338f5e19eeddc79215b24648970fbe1b5c
font_01_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 10404 bytes
SHA-256: 7d11f2db3ee08a1162ed9d1c83a26c807d0e303d411e334fe5557bf77e4470aa