Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e398b5defdc4959…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 23:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c05fa9e56cf7f705721710c18867e82b SHA-1: 59d6a1ee52ef678f714dbb6a5ec9eeb4b946413d SHA-256: 3e398b5defdc495986ea3d6d6e355ff8a32d4eba58a74e2a4b21a1c93ef6eb6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wumag.pl/userfiles/file/44864251690.pdf In PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/83752335376.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/kegekuziwerelopujunib.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/vozakonokogewaj.pdfIn PDF document text
    • http://sentai.cc/data/file/20210903_014458_348.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/21553190599.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/rajowimalonilisenatenere.pdfIn PDF document text
    • http://retailcop.ca/files/wumuwadafuvogitu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/43647769421.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/veliruronupewowe.pdfIn PDF document text
    • http://acril.ru/ufiles/files/mofowuvani.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/wudesin.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/kegeselepuw.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/88042659539.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/78295746739.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://yuvasarkar.org/userfiles/file/lupadubevagipiz.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/83727077884.pdfIn PDF document text
    • http://podushka.by/files/files/kupixibaxesusup.pdfIn PDF document text
    • http://soles2walk.com/data/file/7848452867.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/53224959859.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/61708453761.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/66934744826.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/kuzogezutonagipezar.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/dikelafazewoluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=project+free+tv+keeping+upPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 17324 bytes
SHA-256: da0519c0672b6b0a42f7d31c9f4f6567907bf66972a8a506f5f4d6a2b6e898da
font_01_sfnt_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 10668 bytes
SHA-256: 7d4d578b099121f7dbc18be2d452691bba3155ec89f4c547eaf20e445bed6e77
font_02_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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