Malicious PDF — malware analysis report

Static analysis result for SHA-256 39432b16e98b7d58…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 17:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a78867aaa76a5f7033e235e94937bc08 SHA-1: 804b5240f7f26ede262093d6d7e2b400cf76a343 SHA-256: 39432b16e98b7d58c0925051ba30494d4fa55f0fc73d4e3eb30548569f551a8a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with several pointing to unknown or potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=add+text+to+txt+file+java
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/rotikep_gekana.pdf
    • http://lakujalinifibo.mypressonline.com/jomasumiseviluzafavar.pdf
    • http://kumululurug.scienceontheweb.net/28760885646.pdf
    • https://daxolefuziru.weebly.com/uploads/1/3/5/9/135963055/ledaza.pdf
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/aca3f9.pdf
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/782a4523.pdf
    • https://vufoduvetuf.weebly.com/uploads/1/3/5/3/135302170/xogurovofulus-wukusebofunot-legofode-pojuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d663e6d8-fa4c-459c-b1e8-a141aff58858/what_is_considered_an_exposure_to_covid.pdf
    • https://s3.amazonaws.com/betefowubevat/hungry_shark_evolution_sharkjira_mod_apk.pdf
    • https://uploads.strikinglycdn.com/files/0a847052-d158-4613-ac62-3c486b808521/ferrari_812_superfast_2020_mansory.pdf
    • https://uploads.strikinglycdn.com/files/52157223-24b1-4912-9186-5181b90a612d/iomega_storcenter_ix2-200_admin_password.pdf
    • https://s3.amazonaws.com/sulasatevirexo/how_did_the_british_government_respond_to_the_great_depression.pdf
    • https://uploads.strikinglycdn.com/files/d9f2e131-f582-48a4-81e1-217266c7646a/surah_al_mulk_page.pdf
    • https://s3.amazonaws.com/banula/21807086348.pdf
    • https://uploads.strikinglycdn.com/files/de9e783d-312b-4b05-a2cc-3c53f66dbce1/zanebizotil.pdf
    • https://uploads.strikinglycdn.com/files/cae04bc9-e052-4c9a-ae84-2ef4f4351e10/borevixal.pdf
    • https://uploads.strikinglycdn.com/files/21899f34-e1f8-4f1c-9bf4-1a3cfd7425ff/parts_of_speech_chart_printable.pdf
    • https://uploads.strikinglycdn.com/files/47b8c123-d4a4-46b8-b863-9c3a777cf8b8/13763091891.pdf
    • https://uploads.strikinglycdn.com/files/e7d34fe7-39a5-4c0c-a94b-082b085d6f3d/bissell_power_steamer_heavy_duty_steam_mop.pdf
    • https://uploads.strikinglycdn.com/files/0fd9adda-727d-4c50-89f4-d7f725947ff4/luxapikasodak.pdf
    • https://uploads.strikinglycdn.com/files/66515d81-dde8-417f-9278-1e9708575510/how_to_make_yourself_miserable_dan_greenburg_download.pdf
    • https://uploads.strikinglycdn.com/files/95ad90eb-ebff-443f-801f-9a1b5a64df6a/zesakelegopagesobenope.pdf
    • https://uploads.strikinglycdn.com/files/21bc5841-f81c-484a-a193-ddb75d9dd647/craftsman_yt_4000_review.pdf
    • https://uploads.strikinglycdn.com/files/1b06792d-8ddb-42eb-ad67-605c7303a78a/hans_wehr_dictionary_fourth_edition.pdf
    • https://s3.amazonaws.com/sevoga/49770736286.pdf
    • https://uploads.strikinglycdn.com/files/4cb82e54-52ae-47ab-953c-f4fd484e4e43/englander_pellet_stove_mode_settings.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_off0000ea05.bin
60a079b3ffa6dc3816b70a543e82536bcbc74ba7a0b8b2e1bcae649df64e423d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 4820 bytes
font_01_sfnt_off0000fa91.bin
a8e06579cbbc982a490d4f359f0e0f654052c118dc57ebe2b6ca29212e05edba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 11936 bytes

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