Malicious PDF — malware analysis report

Static analysis result for SHA-256 caedc9a7c4d3e3e0…

MALICIOUS

PDF

69.7 KB Created: 2021-03-14 18:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8685c87dbb7b336e36b9e15ed5dba997 SHA-1: 712f95449953fe8d6434a16341def2a920119548 SHA-256: caedc9a7c4d3e3e05d9b010435dfd399857499a1602ee6e0ada0bc9562fdd496
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'resalured.ru', which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a technical manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://resalured.ru/wix?keyword=nec+sv8100+dt300+manual
    • https://cdn.sqhk.co/kepebeso/T6SUWH7/40907622086.pdf
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5fdc7aad4a22d.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_6025336eb6485.pdf
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/zukogawiwena_bofomota_libagatadu_vepaweluvevow.pdf
    • https://cdn.sqhk.co/tekemozuj/Tja91hc/2198776720.pdf
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5ff2fd51bc0a3.pdf
    • https://static.s123-cdn-static.com/uploads/4501993/normal_60011b552bf0d.pdf
    • https://bogilerilixami.weebly.com/uploads/1/3/5/3/135345361/zewivukipab.pdf
    • https://buxutagugumazas.weebly.com/uploads/1/3/4/0/134095839/b0de95adb.pdf
    • https://tiferivirukituk.weebly.com/uploads/1/3/4/4/134433041/3a54f480fce1.pdf
    • https://cdn.sqhk.co/nomitusibop/6lEiwje/42660499225.pdf
    • https://cdn-cms.f-static.net/uploads/4409244/normal_604ad72193285.pdf
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/8136645.pdf
    • https://cdn.sqhk.co/rojarimeg/9ietMKO/critical_ops_apk_hack_radar.pdf
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/a61ff4275d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad02fff8-1a98-46f2-84b8-906711f3cf50/salario_minimo_para_empleados_exentos_puerto_rico.pdf
    • https://uploads.strikinglycdn.com/files/8bb9286c-f0d5-43cd-aeff-374c4c27f1c1/90857970080.pdf
    • https://s3.amazonaws.com/vatosolikijike/55245193956.pdf
    • https://uploads.strikinglycdn.com/files/8992e3b4-4e9b-497c-9e1a-f79ce4036364/salary_for_mba_in_operations_management.pdf
    • https://uploads.strikinglycdn.com/files/8ae64d7d-9a16-4ad2-ab45-bc7bb27e77d4/31051656210.pdf
    • https://uploads.strikinglycdn.com/files/e64b2dc3-321a-45ab-b922-637544869704/27245968748.pdf
    • https://s3.amazonaws.com/vibuvomomuv/catering_menu_design_vector_free.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_off0000d279.bin
445e247a9973702b0b04c811f55a8b932d362b5e13d1adbc9b12d3f9b90ab075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 5568 bytes
font_01_sfnt_off0000e564.bin
310a27272a8f385966d077a98731049577d64b027cc09ac9929e131e10b3b5bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 10112 bytes

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