Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d3ed25441c84af…

MALICIOUS

PDF

77.0 KB Created: 2021-05-23 08:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 813f2e8d20310b5d9619f8973e87b66e SHA-1: 7d263be85c12a548242cd79c95d1e3685cf72b37 SHA-256: d1d3ed25441c84afcb179b843cda4bd7536cd92e345cc9ba74c844fb9269bf1c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of a large number of external links, including one pointing to a URL that appears to be part of a link farm designed to improve search engine rankings for terms like 'free PDF converter', suggests a deceptive lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=telecharger+logiciel+converter+pdf+en+word+excel+gratuit
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/01d5eafc38a6.pdf
    • https://xujokutiw.weebly.com/uploads/1/3/4/7/134749543/dejamovogifuwi-pesunaxowada-liruwuduxutab-sexikenowun.pdf
    • https://lafumunokude.weebly.com/uploads/1/3/4/6/134666321/5ca518.pdf
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/wesoj.pdf
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/81be6f105c8.pdf
    • https://vuzeruferule.weebly.com/uploads/1/3/4/5/134591890/bovoxiza-noxususilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fizaxo/chrome_tablet_vs_android_tablet.pdf
    • https://uploads.strikinglycdn.com/files/bdf044e5-4142-4dfa-8a6d-76d1a19b39b8/lezorafarulus.pdf
    • https://s3.amazonaws.com/zarevizebi/how_to_read_stock_volume_chart.pdf
    • https://uploads.strikinglycdn.com/files/382b438d-9b5c-4def-8cfc-379f6c33e7e9/59063634009.pdf
    • https://uploads.strikinglycdn.com/files/a1887a43-0efe-4596-aae6-76f431157848/sap_outline_agreement_transaction.pdf
    • https://uploads.strikinglycdn.com/files/17404ec3-7979-4346-b144-695239e0b4c2/87767530754.pdf
    • https://s3.amazonaws.com/nitajosasa/51314135727.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/vogiw.pdf
    • https://uploads.strikinglycdn.com/files/d6c33aef-ba92-4762-9d10-c9dc589f88c6/silupabolefotim.pdf
    • https://uploads.strikinglycdn.com/files/6d631513-b962-46a6-b91a-094e6fd95879/dell_precision_m6800_camera_driver.pdf
    • https://uploads.strikinglycdn.com/files/59ca6058-d4c5-4589-ba23-3cbf222ce3fd/how_to_reset_maintenance_light_honda_odyssey_2003.pdf
    • https://uploads.strikinglycdn.com/files/bb06eb5f-db34-45c2-b0c2-0acb22c423d4/tiluzelif.pdf
    • https://uploads.strikinglycdn.com/files/420485ad-3cc2-4735-960b-c5591353de44/850961384.pdf
    • https://uploads.strikinglycdn.com/files/743606f9-2d6e-4119-a9e7-5858f55779fc/zerepipujiveza.pdf
    • https://uploads.strikinglycdn.com/files/e8ceacac-72b8-458c-99c7-e0df730daadc/what_do_you_call_a_native_american.pdf
    • https://uploads.strikinglycdn.com/files/4edb6206-3f6b-4162-8e71-03b0f50777fa/gitarukulikuzewotidixexe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb4.bin
f7dd559566d845314cc6ac2f4af7aa77d0a919cdc21f413efe9ecae43e5897ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 5408 bytes
font_01_sfnt_off0000fe32.bin
5583adab4281b91ebcb507db541e929804959d5141470574f7c4c12d65c703a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 12708 bytes

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