Malicious PDF — malware analysis report

Static analysis result for SHA-256 666bbbfec6bb812b…

MALICIOUS

PDF

79.7 KB Created: 2021-04-15 03:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8063029a934d3122ff9b755a412fabbd SHA-1: 2e11766a42d64bdcd244857a65326176b6e9f941 SHA-256: 666bbbfec6bb812b098c4e995dfb950c7751072fcec50f5faea72776c85327f2
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to PDFs with numeric slugs, suggesting a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=how+to+reduce+stress+concentration+in+welded+joints
    • https://nunofisodopuw.weebly.com/uploads/1/3/4/2/134234763/seniza_gijodijef.pdf
    • https://fitulukuj.weebly.com/uploads/1/3/4/2/134265825/185b41.pdf
    • http://jifoxife.66ghz.com/frame_based_html_template.pdf
    • http://veraxibowamopax.iblogger.org/ponadipokifukuzifelonosom.pdf
    • http://mibilivo.scienceontheweb.net/18936596065.pdf
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/botov.pdf
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/tuduzo.pdf
    • http://xowanopumug.22web.org/tetiperib.pdf
    • http://fozivot.mypressonline.com/allegory_of_love.pdf
    • https://setanalad.weebly.com/uploads/1/3/0/7/130775470/3261488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e81dcfc5-85fa-4de8-8b9d-5d471cc4b4b3/nosoxidi.pdf
    • http://pimobepetokonud.myartsonline.com/pusevulixilepulugise.pdf
    • https://uploads.strikinglycdn.com/files/4895674b-88f0-4783-888e-f10b3782eb70/ragekewinofe.pdf
    • http://niwimugosaz.onlinewebshop.net/78229167799.pdf
    • https://uploads.strikinglycdn.com/files/f3f00660-84cf-43f8-a725-468c806f99d6/sejezipisodalimafevixuli.pdf
    • https://uploads.strikinglycdn.com/files/63dbcdfc-9588-4160-adc2-d74df1fb8dfb/how_to_contact_panasonic_customer_service.pdf
    • https://uploads.strikinglycdn.com/files/f0862f9d-ec75-4348-a507-b7ce304eb4dd/what_is_advancetrac_rsc_2005_ford_explorer.pdf
    • https://uploads.strikinglycdn.com/files/9b27a05e-b5ae-4813-ba74-196edc489358/kedobojadosejofikirawevep.pdf
    • https://uploads.strikinglycdn.com/files/db94fbbf-5311-4385-a155-7377caab64b6/15674713083.pdf
    • https://uploads.strikinglycdn.com/files/b247fc90-c01b-4bde-8c44-ad8bc42eb4b4/principles_of_real_estate_1_practice_exam.pdf
    • https://uploads.strikinglycdn.com/files/1c3417ae-c208-4b2c-8381-5c1568c144cd/best_bookshelf_speakers_for_home_theater.pdf
    • https://uploads.strikinglycdn.com/files/326044b2-0fee-4dc6-b6f2-059a9c008960/computer_systems_analyst_degree.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb0.bin
2757604c73c81e24c0b67c88aff73d375bbd2bd05c3164be0acbaf90d0515335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 4944 bytes
font_01_sfnt_off0000fd90.bin
51ab96bf8caadd8592c43eed759ea1d3bdc36ab2d79f87d9f9cb7a98ea983850		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10880 bytes
font_02_sfnt_off000122c9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 4324 bytes

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