Malicious PDF — malware analysis report

Static analysis result for SHA-256 216139379eb53e4f…

MALICIOUS

PDF

78.5 KB Created: 2021-05-21 19:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47c27b0bedd26296f05c6a58465e3263 SHA-1: b7b4c3b8919d122e428e202a5972851c74952bc7 SHA-256: 216139379eb53e4f336a52d9c013328ccc63ead43ec9c2daf13dbe2ff3010821
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with one prominent link pointing to 'mezovuduw.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily garbled, contains keywords related to a PDF download, reinforcing the lure.

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://mezovuduw.ru/strik?utm_term=modelos+y+teorias+de+enfermeria+9+edicion+pdf+descargar+gratis
    • https://cdn-cms.f-static.net/uploads/4422620/normal_6046d6dc7acea.pdf
    • https://guserokofetaw.weebly.com/uploads/1/3/4/3/134341966/vunuzalavo.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/78f2314a2e.pdf
    • https://static.s123-cdn-static.com/uploads/4457332/normal_6003b1a169693.pdf
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/zemik_vomonazalogetex_fesukure_timolefaxopud.pdf
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fd10f1db0c98.pdf
    • https://cdn-cms.f-static.net/uploads/4505837/normal_5fe718828bb4c.pdf
    • https://static.s123-cdn-static.com/uploads/4452374/normal_60046cd4f2775.pdf
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/bibuwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/354716df-51db-45d1-96af-91b215255845/will_there_be_a_blood_bowl_3.pdf
    • https://uploads.strikinglycdn.com/files/2c111c26-12a5-40dc-914a-6fa355e7069c/judoxafozujifuzuwose.pdf
    • https://uploads.strikinglycdn.com/files/cf5c2bf6-ca3d-4c7c-a761-6468c4b7708c/legally_blonde_junior_musical_songs.pdf
    • https://uploads.strikinglycdn.com/files/e876573a-253a-4a74-b370-013765d6d9f4/fix_scooter_near_me.pdf
    • https://uploads.strikinglycdn.com/files/8adb0985-666d-4a98-98e1-ebfe26000e31/what_is_compatibility_in_health_information_systems.pdf
    • https://uploads.strikinglycdn.com/files/1578e1e0-a719-4763-95c2-2af3f4ff085b/how_often_to_change_oil_in_rv_generator.pdf
    • https://uploads.strikinglycdn.com/files/f6a872a0-b78e-4601-9216-3c0b2b8e7a72/gusanalonogibabajejeb.pdf
    • https://uploads.strikinglycdn.com/files/b4effffc-8d78-44c9-b6ab-02509b17028c/die_unendliche_geschichte_film_download_kostenlos.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_off0000e270.bin
a09eb08962ff011eb15c5c49e256186df58ff37d97b33585313519fc1eaf6aee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 5528 bytes
font_01_sfnt_off0000f531.bin
c253a0462c628f47a050bcc9db5fd6568d21ce43681cf3d3b1c9effe86f5bc07
pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 12112 bytes
font_02_sfnt_off00011bbf.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 4324 bytes