Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d04e163e66d646d…

MALICIOUS

PDF

80.5 KB Created: 2021-03-28 14:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b18f704ea971ed8a46db0705b0a7311e SHA-1: bd4b9f7e32a4e1186895d9591da85d420283769b SHA-256: 3d04e163e66d646dab1fa6ae4707aa2566d11c0782740c490708460ed5a6df95
126 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to `jumiwimov.ru`, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=basin+street+blues+sheet+music+trumpet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476782/normal_605f6f5c7002b.pdfIn PDF document text
    • http://cupe1.ru/evangelio_apcrifo_de_juanjro9f.pdfIn PDF document text
    • http://smartcreditus.info/mitologia_griega_y_romana_libro7p759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_6026811268d51.pdfIn PDF document text
    • http://bigtittybella.com/32071041616a6ww2.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/runafaxusesedewetilopir.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/belunutikupu.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/70417263266.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/difference_between_synchronous_and_asynchronous_communication.pdfIn PDF document text
    • http://orbitan.fun/how_to_calibrate_a_temperature_probe_thermometer62rvb.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_long_does_fossil_gen_4_battery_last.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_603faf1c99e72.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/introduction_to_behavioral_research_methods_6th_edition_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424026/normal_5fde48d932c9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_67a2773b7c044837bb477e3e646813d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef48fa1d-cdf2-48e2-ba89-143335d7c504/how_to_access_3d_library_in_paint_3d.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/vaccine_cold_chain_management.pdfIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_8fbd034726404239aa361c193d84b584.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_966eb8857c8842d5a7ed0757f590e400.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c988adb-d73e-4acd-85f6-d7fad6bcdeea/6447343390.pdfIn PDF document text
    • http://nubirumoxid.onlinewebshop.net/10963160908.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 5360 bytes
SHA-256: 6f3a0d05a0cda4c2914fd2e286349a7228a02f040216528a4d913ced8d0aa447
font_01_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 11900 bytes
SHA-256: b542fc6e3b1d5acfb9ee0dcbc2ec96de009e967cfe0ebd727910194375563d9a
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832