Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c992cdb42a3fafd…

MALICIOUS

PDF

78.1 KB Created: 2021-03-04 22:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9970ea9cf2ca78e55b97094bed751952 SHA-1: a3c34fe986945c012dc25b30ca3e8c91331aec62 SHA-256: 9c992cdb42a3fafdfdc6101ad87946de1d5545bc7bde3f10bc92701bc2964452
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious or unwanted content, possibly as a lure for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/wix?keyword=app+editor+apk+mod PDF link annotation
    • https://cdn.sqhk.co/lexewagoz/IA8iajd/kupafur.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/nimufeteni_ragolefiti_gojovodurulu_puzog.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/4hgibXu/22839035785.pdfIn PDF document text
    • http://tuvawom.iblogger.org/jiponuvumawotevarol.pdfIn PDF document text
    • https://jixinedoxe.weebly.com/uploads/1/3/1/3/131383771/c48c8d06dc.pdfIn PDF document text
    • https://niresofet.weebly.com/uploads/1/3/2/6/132682193/nelemoliz_mabogujibifop.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/17a5d9601eafc.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/hiBkTge/duck_hunting_dogs_breeds.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/fcqigjf/italian_love_songs_youtube.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/josuwifemewajab-gobus-zuxeni.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/xivaned-goxenim.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/gfCZD0v/9009300721.pdfIn PDF document text
    • https://nebegoxo.weebly.com/uploads/1/3/4/6/134638594/7747857.pdfIn PDF document text
    • http://zinetaloju.iblogger.org/40332570745.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/Hieibgj/ladazilatujoburifevemades.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/4969944.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/4a043.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/tafugaturadupi.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/jbFtghd/extreme_car_sports_racing_driving_simulator_3d_hack.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/zutodafototuxut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://guvukexapa.rf.gd/totat.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/82581164555.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 4628 bytes
SHA-256: 19d41d912243a9eb0e4a7429c2f2d747c396976ae0aea9797e98d5b0429a56a6
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10272 bytes
SHA-256: 1d6fcf021159523e65cb4ad44be2856e9e6425d319ed7d2933c289db2eb40f0a
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.