Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbefabb6b5989325…

MALICIOUS

PDF

78.0 KB Created: 2021-06-07 03:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ca055dd389d5d31916c70cf0e27b03c SHA-1: c1a1389396c90a50b110d28d837f75ab3575487d SHA-256: cbefabb6b5989325a40b7e448dbe75b670ce2c6a768353632071d1006cc01d7a
96 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 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 0.9997

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://huntic.ru/pbw?utm_term=how+to+draw+a+mountain+lion+step+by+step+easy PDF link annotation
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/6289394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5fe0dcb3a2661.pdfIn PDF document text
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/2227529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469374/normal_5fcc023eca74b.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/bfaa2e51f3efb.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/a2d07449-95dd-4c8b-a06c-d556ea541579/25331683275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21ca02a-4234-4b89-adee-f74c774f37d8/sniper_shooter_3d_assassin_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb3882c-d548-4d45-ae74-1fee6b0a853f/fexazubapuvekasofevojul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6d024b-cf42-419f-be33-ac2ec4c357d6/vutojibotodagur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92898e00-e32a-416d-9c51-747d49e21cd7/fomubudoloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd19465-d946-4130-9c9d-059af5d50d9d/zajowenizakaziloxoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7107bb17-0d5e-492a-8779-b2543ef1bb84/47467572210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07ad132-997a-4334-aeb3-57d137422fe9/41298158808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdac89ba-76db-4698-9df1-aac0ff7f0026/digital_marketing_manager_jobs_in_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9cb81a-9639-46ff-b730-2305920e15a9/3120961116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d93d915-f8f9-4ea4-8103-34cfa0468df1/arkansas_driver_license_test_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03372fc6-c223-44b2-8b30-725e7568e00d/bosijajep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868fb033-f750-4643-9a76-4675f0251b9c/reranurugazarisurapexere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8558d380-a7d7-48cb-9f8c-a1e0b4184488/74304444191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0fbddf-43a7-49cf-90da-431d4dd05cad/unit_identification_code_search_system_navy.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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 5280 bytes
SHA-256: 18082901e99c78a7449301e1a3e0967412495844d6f264ec46ac646a323bd5b4
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10112 bytes
SHA-256: d457d84276a9165dd7368feca14376dbfe5345a0e833234072e3685680edec4d
font_02_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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