Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9f939f00a54874…

MALICIOUS

PDF

75.2 KB Created: 2021-06-11 19:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2dd791738a01d6888cb8434950e7076 SHA-1: 80e66c5189600bbd2af167de81656d043f4803c3 SHA-256: 3b9f939f00a548748b846bc5d10fd5e015a731b9a36ed1ab2997e81c5b6dd229
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL suggesting a phishing or SEO link farm tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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-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://pixomot.ru/pbw?utm_term=preschool+tracing+lines+worksheets+pdf
    • https://cdn-cms.f-static.net/uploads/4411001/normal_605013b0d44f5.pdf
    • https://cdn-cms.f-static.net/uploads/4373502/normal_602eaa65c55fd.pdf
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/buzewagusazuxulexo.pdf
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/viwezeselar_dasofegemuseg_remowi_barakuwagadipen.pdf
    • https://cdn-cms.f-static.net/uploads/4457592/normal_60417638a70fa.pdf
    • https://cdn-cms.f-static.net/uploads/4415331/normal_601f0eb7e85ea.pdf
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/xivowasujig.pdf
    • https://cdn-cms.f-static.net/uploads/4487663/normal_5fd27b71d793b.pdf
    • https://static.s123-cdn-static.com/uploads/4414352/normal_60013cfe7be1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a142a43d-fd81-4be2-a77b-954d561dba7c/how_much_is_a_big_round_bale_of_hay_worth.pdf
    • https://uploads.strikinglycdn.com/files/082201b2-4f2d-4664-8a1e-bd1f36da71d9/solupumebawom.pdf
    • https://uploads.strikinglycdn.com/files/fb4bc91a-3126-46af-9dec-c192ce2c0815/lusus_naturae_literary_devices.pdf
    • https://uploads.strikinglycdn.com/files/69fc2908-d8d4-4f53-9fd8-a0ac6d89d3e5/does_burger_king_have_all_day_breakfast.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144993162/bleach_vs_naruto_v2_6.pdf
    • http://negaboxa.pbworks.com/f/bose_soundlink_mini_2_pc_verbinden_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/d68a80a0-9239-4d89-b31a-d8832b1cc97b/66136901409.pdf
    • https://uploads.strikinglycdn.com/files/25e42794-7c69-43e7-8412-3f7594f835b9/naxurotiresone.pdf
    • https://uploads.strikinglycdn.com/files/44e7a133-b6be-4c0d-8b88-fbfcdf260544/rigukaledewijazebanomop.pdf
    • https://uploads.strikinglycdn.com/files/2fb818dc-aa7c-40b0-ae41-bcb324c10fac/susanamawoduwut.pdf
    • http://kapetipubi.pbworks.com/f/super_start_power_pack_1000_how_long_to_charge.pdf
    • https://uploads.strikinglycdn.com/files/e89fb1c2-a84e-43d3-8b36-da48cc962266/37369312595.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_off0000e8cd.bin
40546b4a1c8d9415b10e286cc242af8e682878c964774d5616f019d87aebfdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 5576 bytes
font_01_sfnt_off0000fbd2.bin
abc9ffad544d52be602130e769dc02b8f790810226f6d795547091f80de506d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10364 bytes

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