Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85e7c0fc5acc093…

MALICIOUS

PDF

75.9 KB Created: 2021-05-10 15:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09dccee2f3ef691c17b26e16d105bfca SHA-1: 37a212b0dd15f927d9bc76b5913dff7a3c83dd47 SHA-256: a85e7c0fc5acc0938c73b94f3bee4f54f77bae80a9bdffbb480e10f27bd88133
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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 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.
  • 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://soxebez.ru/strik?utm_term=fe+exam+review+book+civil+engineering PDF link annotation
    • https://cdn.sqhk.co/medugagoviji/91hfgjj/99818349715.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/jfha3c1/lego_star_wars_planet_warriors_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6061ffc294797.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/9hajbAI/drill_down_and_drillthrough_reports_in_ssrs.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/fefowutifop_mezib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_60235d17a1780.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/a1w1oM9/zig_zag_colors_in_vision.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/cS9Mif3/dragon_lord_skyrim_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fec064dad76a.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/wefifirutimez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_605a72f68cc0b.pdfIn PDF document text
    • https://bajawiramedaz.weebly.com/uploads/1/3/4/3/134392410/moxafinenov-kepegeru.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/dotet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/mixorupenevibufibub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425bce84-3362-406e-ba88-a84866caeb49/what_reading_level_are_the_warriors_books.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/vpn_softonic_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/13863126202.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/chrysler_voyager_2002_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e0ee00-06fc-4852-b014-f8180b169732/15597820347.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/frigidaire_gallery_refrigerator_ice_maker_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd0cec6-11bd-408a-89d5-0794f8a0f2bf/91152039984.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_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 5320 bytes
SHA-256: 1952d44c42e0ffbad860e57046aa9c178633c18b9ead7f77478788d3e8c1a72d
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 11928 bytes
SHA-256: 2e7c148c6b4dd91025c850485811772f152c0f1ac70c82eda713c754f92bca9f

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