Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc29fe530795b4a…

MALICIOUS

PDF

82.6 KB Created: 2021-03-25 10:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ec0b206af63ccebac2287bd4cbc4835d SHA-1: 465cb288049ff6168aeb2f3226aad5f0c1455f53 SHA-256: afc29fe530795b4a6d1ceb1090e49a13450d5a30c9c7d9cf48ff59a9c71fdb26
186 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 phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://vilenefex.ru/strik?utm_term=how+much+water+should+i+drink+daily+quiz PDF link annotation
    • https://volasetabis.weebly.com/uploads/1/3/4/8/134879514/6169094.pdfIn PDF document text
    • http://sezituza.66ghz.com/46158590411.pdfIn PDF document text
    • http://dlkmvkoenv.info/38747931594gus8t.pdfIn PDF document text
    • https://vubilidupetox.weebly.com/uploads/1/3/0/9/130970012/7475525.pdfIn PDF document text
    • http://stav-games.ru/onu_kendine_ak_et2wxgc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5feb398ba975d.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/6076546.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/wasubiwila.pdfIn PDF document text
    • http://domsale.xyz/marketing_consulting_contract_template_freeq5z3q.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/86e48.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/vedizowurow_kemuvesiso_bitexiwetomo.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/5c7fc1e952c6e.pdfIn PDF document text
    • https://wajeditaveva.weebly.com/uploads/1/3/2/6/132696335/33fcb5a052e.pdfIn PDF document text
    • http://copyrightreports.com/como_ganar_amigos_e_influir_sobre_las_personas_resumen_cortol60g9.pdfIn PDF document text
    • https://bowolaje.weebly.com/uploads/1/3/1/6/131636675/zizaworafuvexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fe747ff56dba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://derajina.rf.gd/68267143916.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/43657314560.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/womibuzaf.pdfIn PDF document text
    • http://tunazafagid.epizy.com/ericsson_baseband_6630_spec_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/brush_set_for_photoshop_free.pdfIn PDF document text
    • http://jijomelaj.rf.gd/bharat_acharya_book_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 5572 bytes
SHA-256: 1fbb1540484d33ac17f9c62c67b128f623a48246a85c549b200d8b72bf3920cb
font_01_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 10244 bytes
SHA-256: 02752079392273a8796c6c8b25f00755706ac1a026a7f4df0d8101d2292f42ab

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