Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecd2eced8d566c9…

MALICIOUS

PDF

71.2 KB Created: 2021-03-21 02:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0b48cf9f6813dbfba661792bfae48d4b SHA-1: 416a05536d3f336a1246bd551bc9c1a791091799 SHA-256: cecd2eced8d566c9b256b06f339f96e3f080ce95e0cf47f2c59ecd4c037b55d4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, one of which is a suspicious domain (vilenefex.ru) that may host phishing content or further malware. The PDF structure and embedded links suggest it's designed to manipulate search engine results or distribute malicious payloads indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://vilenefex.ru/award?keyword=capitis+deminutio+pdf PDF link annotation
    • https://cdn.sqhk.co/xaxovowupofa/jaLjbjb/get_back_in_shape_in_30_days.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_603f2b6970d33.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofelagi/bgiKjjb/53162951496.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/0ibMidB/vavuvagolenux.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/UhbhhAd/batman_animated_series_toys_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/jFhdMcf/gazonelusokifiromuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/5z1jghd/39952975471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5fcbb7eb0ca1e.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/j5Oiegc/cartoon_comedy_video_download_mp3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_be951a310e53490581533998f2990481.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_2116300239eb49f0a038ae2b6ca6a733.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b576455-06bb-4e7a-8b06-71662a261952/zoxokakori.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_f8b6adc926374cb9ae2bcebd04024ab8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60576eb8-37b7-4ba3-9116-fa0d9e8c948d/7802203823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b56f13-2437-477d-af57-6d357889fb6a/nuzesutumewanoz.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_7c62a152432d411fb2dc6fbba8f619a9.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_e622901b485543b7836ed0bc824f49d1.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_54e92c5fada34ba1861788a89c160e47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5eecdc2-834c-407a-9485-bbe4f6a02792/ximumebejide.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_894e6d680838431092faf7bcccfcd2b4.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_5a168d6d430e441cbab84dbef15f6502.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d7cf4c-da6c-401d-82e7-8f4b77bf7ad5/lista_de_verbos_irregulares_en_ingls.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_13df9139b0184430b6e944a092300ba2.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 4964 bytes
SHA-256: 301eec05ca07d76b999975a48816e326ccaf40a1122863147f45047b481ba628
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 11076 bytes
SHA-256: de7b4b0c98f66116420220204833f6ec5dff0f5377604aee38feabd9e8e9cf06

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