Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe650699aa66c5…

MALICIOUS

PDF

68.7 KB Created: 2021-04-01 10:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6d901d72c03139fdc17af5d1b0680b60 SHA-1: e955addb2f40a99b25a0581d29926ab552ebca6d SHA-256: d9fe650699aa66c57cd815c1027ad665e61300a1a21df32c58807f4c7cacf323
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=polk+surroundbar+6000+manual PDF link annotation
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/4104275.pdfIn PDF document text
    • http://neyroskakalka.site/regency_theatres_perrisvzu4t.pdfIn PDF document text
    • https://zikavudosun.weebly.com/uploads/1/3/4/3/134329779/9975433.pdfIn PDF document text
    • https://sesejeku.weebly.com/uploads/1/3/4/4/134495796/6cc66413ecb0a66.pdfIn PDF document text
    • http://premium-cinema.com/how_many_carbs_in_sonic_pretzel_twistaz9su.pdfIn PDF document text
    • http://mkuu.club/27581582435ol4hp.pdfIn PDF document text
    • https://voxonexagigiwal.weebly.com/uploads/1/3/5/3/135346225/9384f660e7214.pdfIn PDF document text
    • http://sagokorize.22web.org/26857438015.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
    • https://uploads.strikinglycdn.com/files/4082a060-effd-413c-99be-dd1ed4116054/washington_dc_population_2021.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/kovejoboboxifavuwuvagov.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_da0aecfb57f0434b914025826302a8b2.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_fafdb702017645eb802598315f7f1bc9.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_d42c38141e90458d83e2599db8ce5306.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_422e16ed445c4604bd7707acddd77c16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d862c88-9ccf-4b3a-beff-f72f0912bf37/security_analysis_and_portfolio_management_book_free_download.pdfIn PDF document text
    • http://durezalur.epizy.com/roblox_vehicle_simulator_guide.pdfIn PDF document text
    • http://falogivaxaf.epizy.com/tamevesijokusobanexezuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174069fb-9b17-4e85-a9ad-e8caedf4d6d3/60304963002.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_off0000c1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FD 5108 bytes
SHA-256: 96bbad0ffd382d0c2220b37c2279d9bb3b12831686de7d53976b798c570abfde
font_01_sfnt_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 11228 bytes
SHA-256: 5a4e319de0c147e995a22034cab712c713774f1d9aa9f601ed8633e104035e46
font_02_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333