Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcec8b5d1cb0aa5…

MALICIOUS

PDF

81.8 KB Created: 2021-04-06 19:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a83fa35be78f190823e4c51b72d89e82 SHA-1: 3c854028fad1577b4c43e32f061a15df27b9ed57 SHA-256: 0fcec8b5d1cb0aa54ac619ddba8029da6556dc9bb899dd10b8d642b65ceb1a0d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL, https://jumiwimov.ru/strik, is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

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://jumiwimov.ru/strik?utm_term=how+to+learn+to+trade+stocks+for+free PDF link annotation
    • https://cdn.sqhk.co/gifitebona/mibgdPB/piwomemuduvubo.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/gggcgjh/chocolate_sponge_cake_by_cookingshooking.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/jhjejeU/nibibagowodutanabaso.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/z04ia3S/fish_for_cats_cat_fishing_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_60484487ddca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_606af46194727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5ff14aea1ba76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_606247217e358.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/98457fa4-6ce3-4632-b297-93d9ca43f385/arnold_schwarzenegger_encyclopedia_of_modern_bodybuilding_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a248af40-99c5-4838-bc6f-a24c6d5e2d9c/10_day_green_smoothie_diet_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1cbf0b5-687b-44e5-83c7-e7906c3bccaa/the_boy_in_the_striped_pajamas_chapter_4_short_summary.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_25d131b87a274aec82e8fefc8dcd1462.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2056ca-731b-463a-80a5-ce94c91f4aae/rovaxusibimixizapoxok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c469053b-2695-4a8a-88ca-748e3ab7bca3/luzezegadegobikem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a409da-7d7b-45cb-b822-3ee281fa80b6/33583021304.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_9ffebd837c0047929630513d4824ebf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b088d588-7fdb-4501-b9ce-663bcd1b7dfe/renegades_and_heretics_tactics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bd6133-13e6-49b9-a60f-f6ee9b5244a5/diccionario_de_filosofia_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f351525e-6f5e-45ab-b88d-7657b258c522/gokagagarurip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1e7ae0-144e-4482-b86a-b78bbfa36bba/8366798156.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_949144bbd4934401893f966a78c8db88.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 5132 bytes
SHA-256: 828353ba35f94e590b4191a2651a663b1ce89d390a1b6eb83b4a0e915f8f9417
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 11244 bytes
SHA-256: 4a2bb0b58fa4b76fe6a6effb7965137da771488fa26741970c0dd135d3d2974d