Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d14bee30c01e73…

MALICIOUS

PDF

81.9 KB Created: 2021-03-14 21:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6d6cdcabed7994ff3e4c32552c519eb3 SHA-1: eafe9e71ca6b8656ec115fed7e855549741b1915 SHA-256: 55d14bee30c01e733112713fa305ec537cb32e93506d2820474514b296005a10
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9964

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 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://leonvi.ru/wix?keyword=arctic+king+5000+btu+manual PDF link annotation
    • http://pakupuxojopef.getenjoyment.net/how_to_calibrate_astro_320.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/dc_training_plan.pdfIn PDF document text
    • http://fajamad.mypressonline.com/fitness_blender_training_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_601dd74e5c999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fe2aebe2dc30.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/how_much_is_a_sleep_apnea_test_without_insurance.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/artritis_cronica_degenerativa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_603fab95e019e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fe446819de0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/ronamewitomudetagulu.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/chinarayudu_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/flysky_gr3c_receiver.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/19965496338.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/jagopolapik.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/20764737780.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_6aa2f83a018340bf815585f1656e9b50.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_75d950567a18444aaa83ab94953f1f61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salade/ofsted_report_nicholas_breakspear_catholic_school.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_d82ba9d34afa4c669a2f0bf5442eeed1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/export_chrome_bookmarks_from_android_to_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/school_bus_driver_game_free.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_2ecb06fde48a4f119af55186d520ca25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefagolom/sedog.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/asp.net_interview_questions_and_answers_for_4_years_experience_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/lazozudumukidesabo.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/vulugokolijesuf.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_1e5a94e7e9e444df8299a65ca5e0b1c0.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 5400 bytes
SHA-256: df9ef32fb5dffa31d5a0987f530ea08c9fa44cc5bbe1ea60e4293393ed87dd46
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 11992 bytes
SHA-256: 411aee720604081c87f7c21c614e9511761a6d5d331e9b6c9dbcfe97d11106eb