Malicious PDF — malware analysis report

Static analysis result for SHA-256 918acaaf49530ed2…

MALICIOUS

PDF

83.6 KB Created: 2021-06-07 11:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a9ff9b07288adf1973b488c8f65901d6 SHA-1: b70ebf9819f4873c0e28f229bdcbbc83eb2f4a3c SHA-256: 918acaaf49530ed26d517c99082bcf44b8ccf99d1886034db2feb1e2e9d74911
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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 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://crysiq.ru/pbw?utm_term=how+would+you+describe+a+woman PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471479/normal_604e7cfe5d6b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_5fe9fceedb09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_60251b7c0dea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonubugu.pbworks.com/w/file/fetch/144645576/aamc_mcat_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e649d846-35b1-4cb5-adf4-c0de0c1b9adb/how_to_day_trade_options_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0f7ef7-f15f-4022-9aa9-f4e47ad8cb75/97735459645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d739631-7dfd-4d59-8c0e-159e212d755a/how_to_make_a_motorised_go_kart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5719c25-e740-4f05-96ea-82790c7df024/resea_caballo_de_troya_1.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/tenadewimaramariniwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe3c4ef-cb6d-4734-8a89-3965256d52e4/what_is_a_community_assessment_tool.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/f/greek_mythology_worksheet.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/innovation_management_and_new_product_development_trott.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144502194/fibebotesatunovumato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36120463-b806-40db-a572-c00fade37a8e/delta_monitor_shower_cartridge_seats_and_springs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947f35e1-20aa-4b3b-ac76-344a57c54368/how_to_apply_for_ehsaas_scholarship_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a33ac5-7a26-4877-86f7-d8d32cb93085/sujakimun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9897cf66-b423-455c-8cc8-5319cbe24b02/mudesepaledizaz.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/15903780926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3366e3-0b17-452b-ae05-1d3c8da75679/evan_moor_ebooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ceaa806-4db9-4f20-b05d-6708647aa15e/how_to_share_urban_outfitters_wishlist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8170bdb5-c7cc-49a4-bf87-17ffb18b0fc0/python_object_oriented_programming_tutorialspoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf5f5eb-8519-49a7-a8c1-d08befec3172/musog.pdfIn PDF document text
    • http://kekivozafiko.pbworks.com/f/62120809728.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/21123327461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399b5ce6-3724-4a8e-9898-17a24a7ad35c/34870542739.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/f/kinelubasogobifomasi.pdfIn PDF document text
    • http://zuvumuname.pbworks.com/f/72586531187.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_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 5380 bytes
SHA-256: a139084cc6aceba2ec64d816762b05b9b69c29c4af1f21a4644145eb29c14c56
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 10724 bytes
SHA-256: c1eef0cb5288e8ab88a6b69c5a148812497a1441dd3d52219fea712d32252c03