Malicious PDF — malware analysis report

Static analysis result for SHA-256 943a5af4b8e1c0c9…

MALICIOUS

PDF

82.6 KB Created: 2021-03-18 07:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9f4029fc0af48b1b95c31ac724b986db SHA-1: 21b616f22b8a451e2d7ef6467de571c5a3a5c104 SHA-256: 943a5af4b8e1c0c98d612093d648784269177322fcd13c1d00356492653c0f6f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to suspicious domains and one specifically identified as a link farm on disposable hosting. The document body, though heavily obfuscated, contains keywords related to search engine optimization, suggesting a lure to trick users into visiting these malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=google+site+links+not+showing PDF link annotation
    • http://okstore.info/kujojuvolijubpwk2w.pdfIn PDF document text
    • http://santand-es.com/injustice_gods_among_us_year_2_comicjidw8.pdfIn PDF document text
    • http://1-bog.ru/83565625743lwmxv.pdfIn PDF document text
    • http://spainsale.pro/avery_8163_template_for_wordjoeag.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/wufikir.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/56893269829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a3af179-b0a1-4e18-81b1-ea4aecadc9c3/master_forge_grill_cover_bg179a.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/platformio_custom_boards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e992bffd-11ce-4325-a39d-7c6080bb6c1b/63714989120.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/pagomurunodimarot.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_784b78f8c90342d69fdbe331a86331fa.pdf?index=trueIn PDF document text
    • http://dowivadekituf.epizy.com/tidutovodogobekepopon.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/xelawekogojezokanodekupot.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_bfa728e77e084d0bb13bc66e0c84d9d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/juwimedewurunulapepa.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_a082e1100bf845aea7c12f7aca5145bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25e5164-cbd4-439d-a3c8-4287163974fb/julius_caesar_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2619c3a-062e-4a6a-8c64-0d4bae668186/libiverosobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6358537f-d6c9-4c95-bbe1-355eae9c4b48/c_interview_questions_and_answers.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_36223966e3ef4086939e359316ff24e7.pdf?index=trueIn 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_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 3564 bytes
SHA-256: 83b51f5110bf31550ce10d9c1e62a66225434792c381026a4cb350ba92084777
font_01_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 4828 bytes
SHA-256: 141bcac883ea8740e9effe6b7ee1f7f87bbdfaa8d09b71979647a837fb1c735d
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 11136 bytes
SHA-256: 8773c4b6b57f357f159f9579bd5862a6b4b73a8e12cf93cc6f76b813e64646d2