Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53bff02cbcd7f01…

MALICIOUS

PDF

79.7 KB Created: 2021-05-09 19:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0724980bef5f5009a9ced8d389648dc9 SHA-1: 7b92a37e35267357ac47bec5b366f90588bf50fa SHA-256: b53bff02cbcd7f01df17e6ddf29c6bfa4ed49842ebe88438ef904c08cf673f18
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'soxebez.ru', suggesting a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=2012+jeep+grand+cherokee+srt+for+sale+near+me PDF link annotation
    • https://cdn.sqhk.co/jedabawefi/gEhahb4/advent_international_email_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5fd2626b428ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424328/normal_5fc82b5a22f54.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/pjaiaF2/nujat.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/RhfExjd/18534078889.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/rBicjgj/beyblade_burst_app_mod_apk_5._0.pdfIn PDF document text
    • https://cdn.sqhk.co/sokodajep/fidQThb/70248763985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd7cf610492a.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/mukutud/tetokobiwofut.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/cimb_group_annual_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fafed95-2f54-4ffb-b8ee-204b58f5bed1/nuloma.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_a62002cf7a02449eb1db483160b59347.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_d77c0c4e33b647f98f63a9f729be19b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c31866c-8f72-469a-a7f3-9858388203f1/zufuxudolupesafab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb3100c-30a5-460a-b8b8-afaa1ee8a227/gujanobexus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1def41-faa8-4678-a526-3e5b7a6b672c/pagemotopelizamitinidele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f257084a-1a66-439c-b0c5-7133a36de89c/46669701886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98dc601-a194-457a-9dd2-273116c4d1f5/fs-ia6b_ibus_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0807110f-1526-41b8-967f-a29956595424/how_do_you_reset_a_hardwired_smoke_detector.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_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 5940 bytes
SHA-256: c7f59f1a45f681cf1045f5a49eef0d24ae96f9517bcedc121e041927d66ca441
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 10716 bytes
SHA-256: bee41771f5741a4b535d6ee0e54268bf1b58d5edfaa4c7876811d6f42b148b21

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