Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c010c0beca2ac6…

MALICIOUS

PDF

87.5 KB Created: 2021-04-25 02:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2df77fa5c39b85b7af1329bea5ac3a SHA-1: bb56f0136f4047a3b61fd3997786dadc25610925 SHA-256: e1c010c0beca2ac69d8bb6746f3adf6d02e97d4af53e0cb56ef86094cf505432
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('resalured.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a malicious intent to manipulate search results or redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=army+of+the+damned+d%2526d+pdf
    • http://lowafax.22web.org/flying_dragon_bookstore.pdf
    • https://cdn-cms.f-static.net/uploads/4382960/normal_60675846a2e73.pdf
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/46063.pdf
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/vafef.pdf
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/mosujaralogo-mazivak-malir.pdf
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6046ef6044197.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da188c1c-e902-4710-97ab-5e6b91349b0a/1668986200.pdf
    • https://uploads.strikinglycdn.com/files/ddea1d7a-6971-4ce1-bc64-bff18399c19c/gasovibe.pdf
    • https://uploads.strikinglycdn.com/files/9ba3eaa7-aded-4a64-8b5c-157b1e8ed21d/denubem.pdf
    • https://uploads.strikinglycdn.com/files/ec4c1532-813b-476d-ab85-a037a659ee06/drawing_line_graphs_worksheets_tes.pdf
    • https://uploads.strikinglycdn.com/files/fd046d38-c0bb-45da-a46d-7254e1dc99d3/how_to_write_a_basic_script_in_windows.pdf
    • http://tuzoxizusuzu.epizy.com/blank_calendar_may_2020.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_c66d977448ac48a39043f4348806b903.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6b156f7-87c4-43eb-81a2-911b56fe34fe/61045982155.pdf
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_3dcdf27fb3f14cb787f4cc94b40ba74c.pdf?index=true
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_8ecc344a5f584dbca1c9cd5bcbd48d1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c5dd1bf-323c-430c-b0bd-14f84651558e/wunijakibinora.pdf
    • http://gafevudivexer.rf.gd/modular_building_construction_seminar_report.pdf
    • http://zixupav.rf.gd/33043834603.pdf
    • http://vujegifu.epizy.com/presonus_16.4_2_ai.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_off00010eb3.bin
3ed96aad7a5090e892eadc978bd9e5f17843776107113c6ff02843528442dd94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 5028 bytes
font_01_sfnt_off00011faa.bin
fc0ea5ffecef5bf47fb6e3ea04f0d8367a397a4c0cd55d41a5bc0bd4287ad95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16292 bytes

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