Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f19d8ddec45bec…

MALICIOUS

PDF

82.8 KB Created: 2021-04-02 23:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de6e694ecb0e22cda3f455f46606cc1a SHA-1: 2016c874130de76cf05852d89b236aeef701d622 SHA-256: 26f19d8ddec45bec4a21fea94d8c38d379eafe86c37e902b7582b7c03e9145a8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=malayalam+angry+whatsapp+status+video
    • https://cdn.sqhk.co/pewesopefim/uihdLrM/drag_racing_helmets_snell.pdf
    • http://saniwofixapu.mygamesonline.org/vojinuravudexum.pdf
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5ffb3e094a56a.pdf
    • https://cdn-cms.f-static.net/uploads/4403260/normal_601e8c863a6fc.pdf
    • http://guzoseta.getenjoyment.net/how_to_reset_panasonic_split_air_conditioner.pdf
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5fd0f7c609db5.pdf
    • https://cdn.sqhk.co/susojareb/g7Bs4d1/cut_paste_photo_editor_software_download.pdf
    • https://cdn.sqhk.co/ranotigu/d9hbjaX/classic_sport_12mm_fold_n_store_table_tennis.pdf
    • https://cdn-cms.f-static.net/uploads/4415061/normal_60446d429670a.pdf
    • https://cdn.sqhk.co/gusoguribus/Z3ldidR/predator_dlx_fishing_boat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34782ca0-398e-4fdd-9793-46762c81119c/mekotebugojulus.pdf
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_2d657a201f9c4524b75b7a5317ff92cf.pdf?index=true
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_0f48b5ea668844d49b13e24c2a4dbb0d.pdf?index=true
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_9f020fa0265048a6826d2e389b195a58.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_e014eb92f0a5468fa3f4ef58b44ace31.pdf?index=true
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_56786d07b8584ee8bd6dce4b72818099.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9653e271-a4b4-472b-8302-66e2b9359582/37039996482.pdf
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_0deff65f61c84b96a57df111f04407a3.pdf?index=true
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_cf7e6ba5e0b74a399c3c6afe7b2aa57b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b58b06c7-be14-4a05-893b-fc2b97cf4bc5/league_update_stuck_at_9.pdf
    • http://pusapovewazigu.onlinewebshop.net/pitarona.pdf
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_7073bce36f0a4a0c93dae388201f7003.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_5ea3e353669146aaa9adba64cbd173fa.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f8.bin
c8240852e46fbd767bfe833a6bf11a88930875a75df7594fba3277031c983edd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5632 bytes
font_01_sfnt_off0000f719.bin
49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594
pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 2140 bytes
font_02_sfnt_off000100f3.bin
8a131aecd29a065b514468d6252bee9eaca2d89e0b33ff71e5392c96751c7b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10812 bytes
font_03_sfnt_off000125df.bin
e4936bc088db4f0a044f00235171630b1a152b2441b8e27547ca797b7b198046
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 16704 bytes