Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b7510dcccf9143…

MALICIOUS

PDF

64.0 KB Created: 2021-04-04 03:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f5ba394bc3bba768bee0637a07a708 SHA-1: 43bb80be3ce0fca15ea68f9f4146571e8dbd0680 SHA-256: 55b7510dcccf91435978e24666ebb671e9414cc0b9ca12af9a539e197a8be02d
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

Heuristics 4

  • 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
  • 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://ponafet.ru/award?keyword=bronchiolite+traitement+pdf
    • http://lamaded.mywebcommunity.org/bubble_sort_algorithm_in_c.pdf
    • http://luxomozuk.mypressonline.com/al_quran_online.pdf
    • https://static.s123-cdn-static.com/uploads/4383452/normal_6005512f64fe6.pdf
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/c18da.pdf
    • https://cdn-cms.f-static.net/uploads/4466172/normal_6058b54176406.pdf
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/diwejiminogofo.pdf
    • http://najisemure.medianewsonline.com/26303261777.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9bad7d92-1575-4aba-9d9f-92ebdfeefd54/42679876313.pdf
    • https://uploads.strikinglycdn.com/files/c37c2e43-bcf7-4fa7-8a9b-1227c65cc129/mividusu.pdf
    • https://uploads.strikinglycdn.com/files/fd2eb185-09f0-479f-b111-5c2ed1010e60/19635461279.pdf
    • http://nimanexobubibub.onlinewebshop.net/canada_immigration_form_2020.pdf
    • https://uploads.strikinglycdn.com/files/a2d0fdf3-d199-4e50-abed-b938e455e8b3/94520755171.pdf
    • https://uploads.strikinglycdn.com/files/7769244e-05ed-4b13-8967-6e1277480543/english_vocabulary_in_use_upper-intermediate_book_with_answers.pdf
    • http://nimanexobubibub.onlinewebshop.net/nintendo_wii_console_bundle_new.pdf
    • https://uploads.strikinglycdn.com/files/dbd456d9-7f40-44b1-87cd-3a5e6d1819fe/honeywell_hcm_350_manual.pdf
    • http://kavibajegis.onlinewebshop.net/applications_of_biotechnology_in_agriculture.pdf
    • http://manosotidokef.myartsonline.com/how_to_buy_classical_guitar_strings.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddbe.bin
0d19420176192541afe5b7c7c2cb0aecc06074c817938130b5a0d3dc64777c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 5052 bytes

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