Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65bef9c7c5fba92…

MALICIOUS

PDF

80.9 KB Created: 2020-12-25 03:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cab4a8f0b6b5e50e0253ddd644507367 SHA-1: 98cc3e502cfee992abd557b9653dd8a8da396d9e SHA-256: f65bef9c7c5fba926c2a50c3e98558bd3f6313e5bbd9e9f1b274b5a6a5eb269f
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 0.9998

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://trafffe.ru/123?utm_term=wordly+wise+book+4+pdf PDF link annotation
    • https://cdn.sqhk.co/kupovite/gd3T5ie/uae_exchange_online_kuwait.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/ljdjghd/virtual_sim_story_dream_life_quests.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fa58900d4e8d.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemevimox/Mpjatmb/fugitiwubedikesuwavoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fccaa98a0280.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/1jbXlFz/glow_light_drawing_board.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/jiff5hb/bus_driving_simulator_games_free_download_for_pc.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/2580122.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/47ea2616-e1ca-4b2f-bb99-906a5b16fceb/80692169411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbb441a-21b7-4a09-8786-8cec13022f49/tabla_periodica_de_arturo_morales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e669eb72-abf2-41dd-8856-51dcfca13194/29379515536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f01ca4-78f0-4bf5-82c4-4f916bc200e9/49861213086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ae41d9-72eb-4884-b777-ddd7152cdc1e/intimate_apparel_lynn_nottage.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_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 4924 bytes
SHA-256: 4272a93349918d4f4bf37f845fc2b0c515a6679617c847fc576fd610757e63a4
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10284 bytes
SHA-256: 68137de82be022d6abc5fd016dddaf66ba867235f25e0c49322a1aa9abaa9695
font_02_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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