Malicious PDF — malware analysis report

Static analysis result for SHA-256 66952b27d9bc5323…

MALICIOUS

PDF

74.2 KB Created: 2021-03-06 02:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d37b4df7c9503266a2037eb116d137f SHA-1: 818d9e73a10188119c970be2401f25c55487437f SHA-256: 66952b27d9bc53238a56b2463aeaff54eef0aa2c5c4d1cfdcc2225c5db6eb460
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/123?utm_term=how+much+remote+car+starter+installation
    • http://manaluw.iblogger.org/cleveland_browns_injury_report.pdf
    • https://cdn-cms.f-static.net/uploads/4481417/normal_600c2062dcc2b.pdf
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff6964b3557c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a5d50d43-85d2-4947-b5ba-3fb20cda7d58/tefebikupiwimos.pdf
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_eb29d744651c462a86ae7225c0999d4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d181f313-807b-4383-a4fc-8554251b2346/susudixelezatoxixara.pdf
    • http://duvujod.rf.gd/35460216255.pdf
    • https://s3.amazonaws.com/xotomisen/ketozawonamitubejus.pdf
    • https://uploads.strikinglycdn.com/files/4c24de6a-6e49-4526-aea7-0d06f998a1fd/temporary_worker_in_canada_requirements.pdf
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_5ad17a039e844516bb83728edfe476c6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/afdf4f4a-9928-4928-a43c-d37265c297c4/68346670772.pdf
    • https://uploads.strikinglycdn.com/files/79ecf3e4-11d4-4d02-b1f8-23dce8257386/gibotazuterad.pdf
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_b3986d2167584fe09684359202e32fc1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f78f386e-8633-42e4-be16-345d46262333/how_would_you_describe_a_coniferous_forests.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_8cda66353b9246d1a052458fe060f0a7.pdf?index=true
    • https://s3.amazonaws.com/gotenukevepunin/melowevirelewogavega.pdf
    • https://uploads.strikinglycdn.com/files/d928c74c-f398-411e-8c62-5758ea6a4505/most_common_latin_legal_phrases.pdf
    • https://uploads.strikinglycdn.com/files/ccd5e93d-157c-42a7-8aad-64310ccdb52f/personalised_1st_birthday_photo_book.pdf
    • https://uploads.strikinglycdn.com/files/268fda93-93e3-4a28-aac5-970bbc5943ec/sears_sewing_machine_tables.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_434083b9cdcc4068af74f9c437cf28b2.pdf?index=true
    • http://zusuxib.rf.gd/what_is_deterrence_cold_war.pdf
    • https://uploads.strikinglycdn.com/files/d5a788ec-9c84-4380-8f17-8b27d20bac7e/sotodubu.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_off0000e526.bin
a2d22e23236edc7370a20bb48794afa07fdced6ad341300fee8ca4617dbb1eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 5092 bytes
font_01_sfnt_off0000f655.bin
8d07de79d1b17c1a49f0f5566bd2d16d9f79c31331f345ab99ea75f2ba8234dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10740 bytes

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