Malicious PDF — malware analysis report

Static analysis result for SHA-256 74109d520c1791b7…

MALICIOUS

PDF

68.1 KB Created: 2021-03-30 01:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb4eaf0b5a396da23e767ef7edb0db8c SHA-1: 1064c3fc1434be07a85a1cde19a4c626e6461e5e SHA-256: 74109d520c1791b7952561706259a0ba83873dc72122615c7eb524fef9dc2e0e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive link farm point towards a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=double+negatives+worksheet+2+answer+key
    • http://dusikazo.mypressonline.com/american_academy_of_ophthalmology_books_free_download.pdf
    • http://kozevajalun.22web.org/9022755824.pdf
    • http://gosunenibunale.getenjoyment.net/gubimizewodoget.pdf
    • http://verupedobonunaj.22web.org/cover_letter_for_sales_job.pdf
    • http://fatunatet.getenjoyment.net/definition_of_effectiveness_and_efficiency.pdf
    • http://kokulotasuz.mygamesonline.org/67392988844.pdf
    • http://guvinesusavilo.iblogger.org/advanced_trainer_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2448bd6f-d499-4625-bd14-9bcef1e2b409/zakosuwofofemumifuw.pdf
    • https://uploads.strikinglycdn.com/files/62b97ef5-d9f1-4f8c-823c-22f303c53979/80621200258.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_6201c7adefe84313bfae09f9724762b4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/226b4d1f-5574-477d-84c3-21226a65548a/toretoz.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_6ebddcef81524e47a5fb00b2232a6eb3.pdf?index=true
    • http://sefogubijisep.epizy.com/donald_barthelme_cuentos.pdf
    • http://wadoromutisagar.myartsonline.com/sevozusudafut.pdf
    • https://uploads.strikinglycdn.com/files/5abcf5e5-5ce9-4ab8-9cd8-f276344e3f9f/what_is_the_shear_stress_rate.pdf
    • https://uploads.strikinglycdn.com/files/50aa79b9-e96f-4c97-809e-de6e14d41f68/wuwimususekilorojalafiwun.pdf
    • https://uploads.strikinglycdn.com/files/c63b4a0d-aa22-4ca6-9bed-6540ba1713a6/kitchen_pro_bread_machine_manual.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_f5969c244ef3459c9ee414867e54b716.pdf?index=true
    • http://pawuzax.onlinewebshop.net/72430275213.pdf
    • http://tefetuzuzip.myartsonline.com/how_to_repair_windows_10_corrupted_system_files.pdf
    • http://wefimizasolebef.epizy.com/47340602488.pdf
    • https://uploads.strikinglycdn.com/files/09d0179d-b9a9-4225-b321-6198c82f2fb2/ge_wall_timers.pdf
    • https://uploads.strikinglycdn.com/files/6803f7ad-84d4-494e-b2b2-949ccb7b7263/63653816800.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_off0000cccb.bin
8144af84fbb32237b54a970eddf65da859c1a6bf9001c1985a42ec79db7b1669		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 5536 bytes
font_01_sfnt_off0000dfbc.bin
16704604acc0923fe06eab8fbb5c101d9b83c077b24a7004ec085d4056760397		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 10256 bytes

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