Malicious PDF — malware analysis report

Static analysis result for SHA-256 9753eadbb375ce72…

MALICIOUS

PDF

140.2 KB Created: 2021-03-20 05:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aee4355ee372ae295bdffbba1d016e7 SHA-1: d373529e5b44782e16fd40de9ab7531fc3a4d43b SHA-256: 9753eadbb375ce72ef085d639f3ab2947367735073e012ecc56d96e4529fed34
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://jacksth.ru/strik, is likely part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to T1059.007 (JavaScript) for PDF exploits.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=siemens+hydroranger+200+manuel+pdf
    • https://nolaguga.weebly.com/uploads/1/3/4/3/134307058/4738076.pdf
    • http://xepokex.iblogger.org/38649169127.pdf
    • http://digitaltoolsfor.xyz/dazuludifokigegezumunivokbdrd0.pdf
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/3250336.pdf
    • http://mazezoda.22web.org/how_to_overcome_emotional_abuse_from_father.pdf
    • http://spainsale.pro/basic_law_books_for_beginnersquods.pdf
    • https://cdn.sqhk.co/gutinisiv/gjchbCB/zaduv.pdf
    • https://cdn.sqhk.co/mobixipotex/hInLXV0/94172533271.pdf
    • https://cdn.sqhk.co/dibirolinu/00guhhj/zarimeripivorodobumode.pdf
    • http://meetchambre.xyz/who_brought_christianity_to_south_africaaipms.pdf
    • http://fixmarker.fun/spanish_pronunciation_practice_worksheetl10ut.pdf
    • http://draiwenstore.online/zamebizar6jqhs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rixuweba.rf.gd/texas_inshore_fishing_report.pdf
    • http://nidomuku.rf.gd/adblock_plus_firefox_android.pdf
    • https://s3.amazonaws.com/sorapobuk/47483121734.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_493361b8a7e0448ea2881d5bcc2cb65e.pdf?index=true
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_b1f320830b3b4b3da2dc5b511057cad2.pdf?index=true
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_b6742a90948f4a988323567b3466c2fb.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/zuraruner.pdf
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_62bd1c00409e40cfac4bf44aa6a57f35.pdf?index=true
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_02af9bb9d5e74ef29026aec3798d9898.pdf?index=true
    • https://s3.amazonaws.com/tezude/adobe_reader_append.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e24d.bin
a959d07450b5c3eec211d82947e6ad9036fa09312c53f1197eb580a7cc0e9624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E24D 5932 bytes
font_01_sfnt_off0001f657.bin
5cc99ecd0cce68b31c29f82ef58f7f757a26ac3d59d23b265bd394fcd69007c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F657 12796 bytes

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