Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85bf26f37cba909…

MALICIOUS

PDF

84.0 KB Created: 2021-03-24 15:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b1f127d7c9b12f13d9bf69e8d3ae4671 SHA-1: dc67df7348dc5aa9043b538c8f5c9b35227e8d5b SHA-256: c85bf26f37cba909043af5d1136d1de54ff897fb13d57b1a919bd480d3bcc71e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and are likely intended to redirect users to phishing or malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=amendments+us+constitution+pdf PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/cxiev9n/fast_like_a_fox_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/Vonibib/netflix_vr_app_movies.pdfIn PDF document text
    • http://nanolenka.xyz/lugekatamzp86l.pdfIn PDF document text
    • http://dle-tpl.site/voltaire_candidejtlcd.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/Zdgijbd/44240076823.pdfIn PDF document text
    • http://idealica-itufficiale.website/columbian_exchange_map_ap_world_history0j8yr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/00f4dc5d-8a2a-48a4-88f4-ec716148bf4f/pagugewapediresazijugog.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_defae806e18d41ecb4e1435787b55fc2.pdf?index=trueIn PDF document text
    • https://f19d2187-ce67-4d04-8798-eef694565169.filesusr.com/ugd/bd4746_1970803a1b2343c1a0dea2322cca1112.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/154a08b0-bbc5-4d5a-9dba-505ca729e3a2/how_to_use_log_table_for_division_and_multiplication.pdfIn PDF document text
    • http://nepupiborama.rf.gd/brain_on_fire_full_book.pdfIn PDF document text
    • http://lusalelafujijo.epizy.com/unlock_bootloader_htc.pdfIn PDF document text
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_28765008d55b44b5b7cc822ac7e2def6.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_47ab599addda4aa7bcf0033b11b7da1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ebaf01-df7c-45a6-986b-bdfadece9b54/84741240042.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_8d4836f4d162417982a0c60d2583bed6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1f2667-aa19-4ae0-9cfe-fdbb46883ded/90402606229.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_a47b27f8b19f4572aa6d706ee77ad8e8.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_2cc9b462b0d644e583b7bfa05153c14c.pdf?index=trueIn PDF document text
    • http://velawomonoxejuz.epizy.com/overstock_twin_sheet_sets.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 4832 bytes
SHA-256: 472ec298c35698f4671c1e5b2f67baa143e964f969e0fecc50017bad3d9bab6b
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 10496 bytes
SHA-256: fe73837bd3f7df4cbf95cd7b8ba87e5105c43217f432884bef3ead4aee9c7fac
font_02_sfnt_off000134a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e