Malicious PDF — malware analysis report

Static analysis result for SHA-256 625c6ad57fd6fe4e…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 23:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 132775ecb39fc862815f02ce4e1d2ae3 SHA-1: f6db548eaa5db4be30b7d5a8aeddb43788f22066 SHA-256: 625c6ad57fd6fe4e2f3ae6f03cdf1250d8d2ac379b0350d278a68fe0aaa226a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a specific link farm detected by PDF_SEO_LINK_FARM, suggests the document is designed to redirect users to potentially harmful websites. The ClamAV detection as Pdf.Phishing.Trojan further supports its classification as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=freshwater+biome+animals+adaptations
    • https://jelalepoxona.weebly.com/uploads/1/3/4/9/134901657/kiwowub.pdf
    • http://medebupima.sportsontheweb.net/casio_privia_px-870_reviews.pdf
    • https://static.s123-cdn-static.com/uploads/4366015/normal_6007382e48eff.pdf
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/2277689.pdf
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5feb52da4c946.pdf
    • https://zosagejezigim.weebly.com/uploads/1/3/4/7/134709887/ruduguwakowoze-pisetal-wuzaseb.pdf
    • https://cdn-cms.f-static.net/uploads/4389805/normal_60589b100052c.pdf
    • http://logemopi.22web.org/pedagogia_critica_definicion.pdf
    • https://cdn-cms.f-static.net/uploads/4489599/normal_602a71d9dfba0.pdf
    • https://static.s123-cdn-static.com/uploads/4467030/normal_5fe5f1cbe6f65.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_0ea373965aa640cba062de2562d30208.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1ce721ad-ec54-4298-94ac-a2aeb971faa5/does_james_allen_sell_lab_created_diamonds.pdf
    • http://gapifemesi.rf.gd/email_writing_format_for_job_application.pdf
    • https://uploads.strikinglycdn.com/files/91a5a111-f543-42f2-97cd-ea28205cc208/vusipinunutafo.pdf
    • https://uploads.strikinglycdn.com/files/258f4d9d-5406-4b0b-9f8e-3b430d543aab/star_trek_voyager_cast_season_5_episode_13.pdf
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_61877a7eb32b4939823e5987db905bc6.pdf?index=true
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_f84c726d6b1c4100a39cfaa68fd88e53.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a98f188-3e2e-488d-82ec-988c5d7c420b/why_use_a_heat_exchanger.pdf
    • http://nisetekotixob.myartsonline.com/math_minutes_8th_grade_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/e6386c5e-57bd-4db5-a4fa-b5d0f5adecd6/lg_mini_split_system_parts.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_off0000f435.bin
cf2a9a223e008e43b09cb173d1198cb4a702e5293f639cf387a292cfa2052a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 5388 bytes
font_01_sfnt_off00010663.bin
f190aa0c35ae072b3c40ee7a033a3e44ed65f65a9012cb4d0e516e07a3231c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 11160 bytes

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