Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f41ad7d88ccf9b…

MALICIOUS

PDF

81.2 KB Created: 2021-04-02 00:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e6e4c122268288440a411c984bbd499 SHA-1: d60e7787f35926a7f1fae4f0acc5c87dc822da55 SHA-256: 90f41ad7d88ccf9bda3e1c4c0515b18be59ab138455987cf548c407416008cf2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to a link farm, indicating a likely attempt to manipulate search engine results or drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/award?keyword=magazine+pdf+sample
    • http://zodatowafe.getenjoyment.net/nasasiwuruvixumebudula.pdf
    • http://xenalebosob.scienceontheweb.net/36465131341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_1edf9ad5f498495fa72b4e0d9422e66c.pdf?index=true
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_283c44d44bb04852a9b265be54ba0dfd.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_9250b286b5054bc68576c5b40ffca169.pdf?index=true
    • https://uploads.strikinglycdn.com/files/535e4aad-11d7-4c69-919e-083f0fe6ee40/wijituraxafaxaxu.pdf
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_98e91a1f95f647cfb3807f3e612075d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a70f0c1a-b04f-4f0b-b6c8-b6c7290dad3c/how_to_use_keurig_with_coffee_pot.pdf
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_285f4755c1064edc9d2cfe24265d24f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5b336acf-35f2-499c-898d-1661b2b6e61d/emotional_intelligence_daniel_goleman_1995.pdf
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_81d5de95df904b71905f71846916d402.pdf?index=true
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_3d8a01b6e6a04da09692fbccb166726d.pdf?index=true
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_64cae6be6d6749078c003937d6633d1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/043ea5cc-3648-47fd-8fd3-620f07ee421d/bipebojegi.pdf
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_21e8f34c184d41e78128c4b3a58a724f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a85ddf10-d322-4306-8e81-226310aadc6b/driver_hp_3015_win_7_64bit.pdf
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_2f0ccce378a345eaa6f67d1691a52c25.pdf?index=true
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_c769e7becf544f708cd4db8b7c00f6b5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d1d82a0-458b-4f25-9352-82aa89afa878/grade_1_english_workbook_sri_lanka.pdf
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_5b082d8096bf491684373a8427359a5b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f1915b3-22fe-4977-95a6-f2e1b4c479cf/zifomozipegekaw.pdf
    • https://uploads.strikinglycdn.com/files/f96864f4-43b2-4b97-8c4a-701e4d27e46e/mike_meyers_security_practice_test.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_off0000f2fd.bin
ec5e44d2d3a56096157350d371be74a29cb03f1be45d810ea01ec16403f0d556		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 4916 bytes
font_01_sfnt_off000103a7.bin
e4f6fd940176c52ad888a6f634eb5165430178582c6829bf68c671c898e40dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 11116 bytes
font_02_sfnt_off00012984.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 4324 bytes

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