Malicious PDF — malware analysis report

Static analysis result for SHA-256 154442216d838722…

MALICIOUS

PDF

78.9 KB Created: 2021-05-27 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 471a0189cfa59ce74850a7ae56376fe4 SHA-1: 7e2ba446f1cc6b2ab2ce0688ff4801b96ffa7202 SHA-256: 154442216d838722895c1fa284cbb447e5806664034e6a9da0f51ece070ee8f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF link farm', with one primary malicious URL. ClamAV and ML classifiers flagged this PDF as malicious, specifically noting phishing and trojan characteristics. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-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
  • 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://jumiwimov.ru/strik?utm_term=is+mango+true+to+size
    • https://cdn-cms.f-static.net/uploads/4374956/normal_6047f506e15eb.pdf
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/fikamukobiwobez.pdf
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5fc7f75ade087.pdf
    • https://cdn-cms.f-static.net/uploads/4481154/normal_6065214431f5a.pdf
    • https://static.s123-cdn-static.com/uploads/4466386/normal_5fef6b096883d.pdf
    • https://static.s123-cdn-static.com/uploads/4369763/normal_600920748c9f3.pdf
    • https://gagafilesiruw.weebly.com/uploads/1/3/4/8/134886729/d7db971f72aa306.pdf
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6026005ed4ae4.pdf
    • https://cdn-cms.f-static.net/uploads/4405195/normal_60176fae460ff.pdf
    • https://muvozipiga.weebly.com/uploads/1/3/5/3/135391344/8031344.pdf
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff3d9e794435.pdf
    • https://gelavunojojudon.weebly.com/uploads/1/3/5/3/135390257/lutorepuguxosupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cef30d58-e5f4-4a8d-b145-cd80b87296cc/energizer_xbox_charger_blinking_red.pdf
    • https://uploads.strikinglycdn.com/files/f3560c5e-af4e-4158-a7fb-1d5b12c87fde/where_is_the_learn_button_on_liftmaster_keypad.pdf
    • https://uploads.strikinglycdn.com/files/193c4d70-eb03-4185-9f36-18a6f7a5ac93/55798926591.pdf
    • https://uploads.strikinglycdn.com/files/e8d61b0c-9554-4cb9-ae42-504578805134/convertidor_de_coordenadas_cilindricas_a_cartesianas.pdf
    • https://uploads.strikinglycdn.com/files/36316c4c-6a95-499e-adb0-0c37c51ed59d/wivelameza.pdf
    • https://uploads.strikinglycdn.com/files/cc9cd256-f1ea-451b-8bf8-f2dd4298682e/la_casa_de_bernarda_alba_resumen.pdf
    • https://uploads.strikinglycdn.com/files/f1c0da8c-14ae-4d19-a401-bf0f7d8c48be/5300972377.pdf
    • https://uploads.strikinglycdn.com/files/6c885989-8033-4ecf-8a37-d7ad32276acc/what_is_the_moral_lesson_of_the_story_of_the_lion_and_the_mouse.pdf
    • https://uploads.strikinglycdn.com/files/5cf65783-2ab7-469a-a85f-72dec909d1f3/jabapakirisopuduma.pdf
    • https://uploads.strikinglycdn.com/files/d23131ce-a681-482c-974b-ca7601cd6f76/resumen_del_libro_amor_en_los_tiempos_de_colera.pdf
    • https://uploads.strikinglycdn.com/files/0e3295a4-2f88-4b7b-8e5b-62f3ddc1b286/26534578530.pdf
    • https://uploads.strikinglycdn.com/files/8af9bca9-b45b-408f-9adb-e2f4eb1a1476/what_is_the_most_popular_wii_game.pdf
    • https://uploads.strikinglycdn.com/files/7f1a5ae7-68df-40c5-b2bb-fed3a374c37a/lomulabitojesituzor.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_off0000ebd2.bin
26a508793e7f2a7d399bb0f54c6a061f7eb014fa8001f673c4a08f28fbac277c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 4960 bytes
font_01_sfnt_off0000fc9f.bin
b5de91bd05447640170ee9b37ee9e71bc77c78e92044fd2bffcd2de251646dbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 19324 bytes