Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6d8ff0ce0748da…

MALICIOUS

PDF

72.1 KB Created: 2021-03-22 11:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0c1f394e323a06063ba60fe3e786b27f SHA-1: 694e3d8197b3026b2ac17ee51ce2e142b65283ad SHA-256: 5b6d8ff0ce0748da54b41bb86ddb446cbdd0be03804ef00876c07344f2dcb408
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'xajibur.ru', which is likely used to host a phishing page or download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=aws+cloudformation+kinesis+firehose+example PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414679/normal_600501877e13a.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/jGggOgf/knights_table_rust_server.pdfIn PDF document text
    • http://wigisosidika.22web.org/generac_gp5500_owners_manual_oil_change.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_60484e411a0df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_603c1aeb30756.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/TtsMhcO/lafomegujilurizawib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_600f8307608bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_fd971b84e74c4b908adc92e5cfdeb6f7.pdf?index=trueIn PDF document text
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_0cdcb6e223464b31acc1923579ac2e01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/hp_laserjet_p1606dn_cartridge_price_in_india.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_45467b5f815b4b9f8e31121dcab94fb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/android_tv_box_x96_smart_tv.pdfIn PDF document text
    • http://gafigap.epizy.com/21519046797.pdfIn PDF document text
    • http://gevogorusitaw.epizy.com/ad_hoc_reports_define.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_16a64e4e82fe4ed495eb3d2d027123eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/chromium_older_versions.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/creature_3d_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/legadi.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/2184976631.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_88bad776283140808cc063be7781c3de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/fadurigakedixakemom.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 5608 bytes
SHA-256: 3885c056798d41b0097405784a1f3647179c4ef183d2184b1c681f889d253d59
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10744 bytes
SHA-256: 66d3ea7b97543aecf981f25ffad5841a41a0d13c8559af5b8c19daef52637474

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