Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c55166acc351f2…

MALICIOUS

PDF

72.4 KB Created: 2021-04-06 08:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d47a7c618b7826568b18113888eaee SHA-1: 7c9ad8d99ad721b20a108a7b72972ff0428ec1c5 SHA-256: c8c55166acc351f2b4f98a5753afdce1ce673b48b3fe8ab2e2a3866c0e1c3946
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to potentially malicious or disposable hosting sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=brentwood+baptist+daily+devotional
    • https://cdn.sqhk.co/kopenanum/k1bhejd/69537433514.pdf
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/ad440a.pdf
    • https://cdn.sqhk.co/puzadowoke/9hihhuf/71933413786.pdf
    • http://legko.travel/xelonim3hc.pdf
    • http://pamatidela.getenjoyment.net/pemegaxuzu.pdf
    • http://furniture21.online/wapekiweluwujozoukuk.pdf
    • http://static-start.top/geography_trivia_quiz_questions_and_answers5dwb0.pdf
    • https://cdn.sqhk.co/gixedomawa/9tOASii/milamaf.pdf
    • http://natlegend.space/will_grayson_will_grayson_quoteskup4i.pdf
    • http://bonboxstudio.com/what_to_study_in_civil_engineeringigs77.pdf
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/7799676.pdf
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/df1c78dd8a57bf.pdf
    • https://cdn.sqhk.co/budufunewuf/hhggjdD/50992344150.pdf
    • http://maxist.ru/aplikasi_bandicam_full_cracksfkuf.pdf
    • https://cdn.sqhk.co/rawerusiwala/GVkiiEu/laser_wood_cutter_machine_price_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fataragoreb.myartsonline.com/80322891977.pdf
    • https://uploads.strikinglycdn.com/files/ecdc534c-a3c7-4ea7-bc39-77cdb4b2bab9/computer_programming_for_beginners_learn_how_to_code_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/bb7f4c3a-0ffc-4622-8751-fa92e8cf2d0a/how_to_count_to_100_in_spanish.pdf
    • https://uploads.strikinglycdn.com/files/6e72c81b-e9d6-48ec-a5fc-79c6f3606e23/mofupixatetabiv.pdf
    • https://uploads.strikinglycdn.com/files/2cf73c7b-8725-4a80-88c7-5b3d27891320/what_to_bring_to_car_inspection_ma.pdf
    • http://xasagode.myartsonline.com/birosafetodunog.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_off0000dc96.bin
9fb1fa7cb34ec908127d9a48bf122c9500c004786a86524def50cd70edfe3bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 5396 bytes
font_01_sfnt_off0000ef0f.bin
7b541e3df3dd2b6d131d6892ff272e2463a314bdd22eef1ec36bb93833258daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 11032 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.