Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcb23c054e19e16…

MALICIOUS

PDF

82.3 KB Created: 2021-03-06 16:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c56658ae6db491ce73427cd94d789cb SHA-1: 16063a6bd8704b659c9620b23887a633dc98e995 SHA-256: 0fcb23c054e19e167810bb953603c7a0f2e9cef8555eb060fa5f2c00d756e5bc
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that directs the user to a suspicious external website, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links within a PDF is a common tactic for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/wix?keyword=agarose+gel+electrophoresis+lab+report+discussion
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/pexob.pdf
    • http://fujigukatujewu.medianewsonline.com/samsung_wb35f_camera_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4451574/normal_603f0bd8b2c4a.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_60411c6471157.pdf
    • http://werojati.getenjoyment.net/betavamor.pdf
    • https://cdn-cms.f-static.net/uploads/4475997/normal_600d24bab75f9.pdf
    • http://nafarami.medianewsonline.com/logical_fallacies_lesson_plan_high_school.pdf
    • http://xovijezup.mywebcommunity.org/programa_de_ingles_preescolar_aprendizajes_clave.pdf
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/zenivovumuv.pdf
    • http://fuvesozufinefi.medianewsonline.com/68988198273.pdf
    • http://biwiroxefamir.mywebcommunity.org/how_to_use_a_rainbow_se_vacuum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dudigonifu/midet.pdf
    • http://redifigikutusoj.myartsonline.com/92584354759.pdf
    • https://uploads.strikinglycdn.com/files/888d9b94-2ff5-42eb-af8f-3e4452c746dc/gotam.pdf
    • https://s3.amazonaws.com/befarekogol/carrier_truck_refrigeration_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/9252d099-fadd-409c-b3f7-4b00114e86cd/most_important_quote_in_macbeth_act_1_scene_2.pdf
    • http://vejegaba.atwebpages.com/29377308090.pdf
    • https://uploads.strikinglycdn.com/files/2af41718-6430-48b9-a0bc-c59131875ed3/t_mobile_samsung_galaxy_s5_software_update.pdf
    • https://s3.amazonaws.com/viwoxuz/dibir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f778.bin
1c50e5acf719a5ea644262587b2e87987c99971b5a41450cf5ba0c483dc4df53
pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 5344 bytes
font_01_sfnt_off0001098f.bin
9d1cad30b0567834181a0db979d4fbe8ed9224943c6fbe02b9a39fce131afec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 10380 bytes
font_02_sfnt_off00012d08.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 4324 bytes