Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8e412d6619c30e…

MALICIOUS

PDF

88.2 KB Created: 2021-05-20 22:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2334ea1c34274eb1ea937b96d70d7f2c SHA-1: 670cc18b45cf58161d975a530a311d099c4b7371 SHA-256: 4c8e412d6619c30ec8c612e1e62ee5f6fb46662b74471984268d1e649316e0f8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. One of the primary external links is to 'leonvi.ru', which is likely part of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/strik?utm_term=joyroom+jr-t03s+manual PDF link annotation
    • https://galexoraka.weebly.com/uploads/1/3/4/5/134524836/1220515.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/52b6cf9328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fe2d1b964269.pdfIn PDF document text
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/23fbbcb4df8ff.pdfIn PDF document text
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/punakinaseda-moraz-bugomumiruk.pdfIn PDF document text
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/5379800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ff36c766db8f.pdfIn PDF document text
    • https://sisufowikukutu.weebly.com/uploads/1/3/4/3/134311685/kibukuruneruk_zofalegedebimiz_begivefidereb_sawogom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_6060314aad96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_6053a45a8ef8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d3e3b7-4cf4-43ac-a513-385921aa7eb1/oral-b_pro_5000_power_toothbrush_smartseries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9000fa6-c715-4ae4-ab7f-edbf5cd62017/14140504278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14df574d-4e26-406f-91cf-794f1524ea2c/hot_springs_sovereign_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8a178c-ec4d-44ec-80f7-7d6d59eda2ad/5340926437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb3b9cd-2b17-4bf2-a3d5-8f75c929612e/oppo_bdp-103_region_free_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0702293e-2af3-4b04-913b-65ea86e8a6d9/99756917891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b387588-16ba-49bc-ba35-c3539ad0e37a/wazarojemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e66d32-66ff-4264-bd2f-569b1a1b469e/19822279457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5b69ca-7651-4efd-9cc3-71fb20d04a43/the_importance_of_being_earnest_play_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cdf5dd-991e-4fbf-a74a-32acdb2241b9/pofusug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe41d1a-a0ab-42b1-a818-ad1ee8e15dce/46908857006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8c159a-b9a1-486e-a153-020b116de4a3/nexukabapipidusoledelol.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 5336 bytes
SHA-256: e1b01782b4b040bd68ac152a9c1d9ffb3bd239a7de379ab95bf5f049c8ed3ab4
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 21896 bytes
SHA-256: 6b111bbf6f88412eae790dfc869f6d9316528c3f48815b8b82df8914cf5893fd
font_02_sfnt_off00013cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDA 16112 bytes
SHA-256: 6bfd663be811f4c0caa16031a69679ba2b5a79eca72185f30448f1bd3e23166d