Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc8175b530daa24…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cab1dc0f7ba72072da445c7c2f386637 SHA-1: da8094e9df8a56a2ee65969288e88775bc8d8ee2 SHA-256: 3fc8175b530daa241115d0634c95653779b02769c0adad29463e0b65f54ca001
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('druttle.ru' and 'trendmobile.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=predicting+double+displacement+reactions+worksheet PDF link annotation
    • http://trendmobile.ru/522459993708lh6s.pdfIn PDF document text
    • http://sputnews.com/how_to_use_ultra_eliminex_detox_drinkg19ws.pdfIn PDF document text
    • http://nigasheff.xyz/what_size_file_for_3_8_chainsaw_chainaxq8f.pdfIn PDF document text
    • http://yandex-dostav.ru/38649632671kzpir.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/automatic_control_engineering_by_hasan_saeed.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/18525062583.pdfIn PDF document text
    • http://menformula.xyz/busosodenoparpre4.pdfIn PDF document text
    • http://korixipedur.iblogger.org/utility_theory_economics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekumut.epizy.com/nufilafaxikesem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eeb4a17-42fe-430e-8a7d-78f0dab6a96d/alfreds_easy_piano_songs_christmas.pdfIn PDF document text
    • http://mupumirupuwanaf.epizy.com/nafixemogux.pdfIn PDF document text
    • http://memekafese.rf.gd/44421876394.pdfIn PDF document text
    • http://wopawer.rf.gd/sirof.pdfIn PDF document text
    • http://rivetibixonapaz.myartsonline.com/makalah_penyakit_bronkitis.pdfIn PDF document text
    • http://darozux.epizy.com/answers_in_genesis_vbs_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb12bd9c-4318-4f48-a423-268c69d9235d/80717105160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3d4e2a-6a00-47f1-b252-98f1ffd6f661/xbox_360_xbox_live_connection_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3c7841-d106-4dde-a65d-d1a3d6073436/rancilio_silvia_pricerunner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b47cce-cae2-4b97-aeef-e5212d7aa1ad/real_book_jazz_song_list.pdfIn PDF document text
    • http://jiditorugap.epizy.com/is_there_a_motion_detector_light_bulb.pdfIn PDF document text
    • http://kujujonagojatu.epizy.com/nouveau_look_pour_une_nouvelle_vie_pisode_complet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f2e08e-4d16-4e28-90d1-a8de8ad18467/83571280502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb4f160-936b-4389-bbe8-8f3d68625406/89185105048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436c7fff-37fc-48ac-8ac4-2eb7667057a5/bazofelavopetu.pdfIn 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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5784 bytes
SHA-256: e7012f818f3c1584211d12617dc64a895499480778e0153f419a4c2e8cf75436
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10592 bytes
SHA-256: ac9773ca05e1765f50db6788d04362c32c904353ffe3fc7bfe7959b47bf0a6e8

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