Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e216e6e717022f9…

MALICIOUS

PDF

76.2 KB Created: 2021-03-25 16:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87bcaba42192e42a2924e0392c5c193 SHA-1: 6396840287308bfe75f0b3f82eaf8482bc445dd6 SHA-256: 6e216e6e717022f9a00cf0c996aba6f8a7e91dab09aeec067fdecce10cfd57b3
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' which suggests an attempt to manipulate search engine results to direct users to potentially harmful sites. The presence of embedded URLs further supports this, as they likely lead to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/123?utm_term=journal+geographical+information+system+pdf
    • https://cdn.sqhk.co/povuguzuloga/iahbhai/lagu_tanah_airku_versi_alffy_rev.pdf
    • https://cdn.sqhk.co/rasepotobami/iLo7jbR/41934852859.pdf
    • https://cdn.sqhk.co/bilexodofose/9zmhccv/felefikazalekatafoti.pdf
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/vikorugul.pdf
    • https://kunotokadi.weebly.com/uploads/1/3/1/3/131379116/mupexoxesobi-tamisamelamilo.pdf
    • https://cdn.sqhk.co/revinoxu/hjjjihq/lg_refrigerator_smart_diagnosis_app_download.pdf
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/ribuwemimolujowuxupu.pdf
    • https://cdn.sqhk.co/zulatobi/lYGPidN/honda_gx270_engine_for_sale.pdf
    • https://cdn.sqhk.co/rufadexu/hWejigi/photoshop_background_images_psd_files.pdf
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/c71debd8.pdf
    • https://cdn.sqhk.co/nipigagavadu/EjOjihi/bassinest_fitted_sheet.pdf
    • https://cdn.sqhk.co/ravawiku/gd0G4gd/noir_chronicles_city_of_crime_switch_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_6b2d4e334e984d6caf21c18e6e004477.pdf?index=true
    • https://s3.amazonaws.com/pilazi/varukalup.pdf
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_016ca50ff8c64876b3521ca46ec339a0.pdf?index=true
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_546bb538b020424397f47060a32fadf4.pdf?index=true
    • https://s3.amazonaws.com/wukevirenesu/how_to_work_polk_soundbar.pdf
    • https://s3.amazonaws.com/fadupazageraf/jezedij.pdf
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_13d26afaa9604b3ba55d11407f211789.pdf?index=true
    • 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_off0000e937.bin
04a3f4341638e2c50ab0d31bd6809196633d899423ca506d9416396eb42bfb7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 5660 bytes
font_01_sfnt_off0000fc5b.bin
ab9b157a682b3ce0e8efb3bc6a1ef91796852a443ce59adb9f66259246af9a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 11576 bytes

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