Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b24355d53dcd2e9…

MALICIOUS

PDF

75.9 KB Created: 2021-01-21 15:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 942a09069efc3b6cb37062188115aeff SHA-1: c9b15005333cc2b22d495e20c8c4468143d9b0be SHA-256: 0b24355d53dcd2e9924aff4d14c81b563e90d9071e16fbdcb6c17765648da417
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to 'jottigo.ru' and a query parameter suggesting a lure related to the 'Samsung multiroom app not connecting'. This indicates a phishing attempt or a redirect to a malicious site. The presence of embedded URLs and the overall structure suggest it's designed to trick users into clicking through to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/123?utm_term=samsung+multiroom+app+not+connecting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fa25758a6d90.pdfIn PDF document text
    • https://site-1172655.mozfiles.com/files/1172655/wipujatakojurebumedigubut.pdfIn PDF document text
    • https://site-1176085.mozfiles.com/files/1176085/nccn_guidelines_endometrial_carcinoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_5fd1a9f5a66d6.pdfIn PDF document text
    • https://site-1180773.mozfiles.com/files/1180773/80623588170.pdfIn PDF document text
    • https://site-1257119.mozfiles.com/files/1257119/kutufevuvetewalogafodinu.pdfIn PDF document text
    • https://site-1175508.mozfiles.com/files/1175508/67917186644.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/K0gh4ij/63480916433.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/hcSiejh/radio_italy_live_new_york_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xopimuje/hBhhcJx/piminisulalosesutajifaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/bjeFghH/gutotuvifaxomavetag.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/jjagFic/famous_blues_musicians_from_mississippi.pdfIn PDF document text
    • https://site-1168055.mozfiles.com/files/1168055/kurugipevanebadogemere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_5f9d5be4313e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fc675d2dd255.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genedonapubefe/8394745592.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/sitivukonupojenebuv.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/webex_room_kit_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/wodafovegu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 5236 bytes
SHA-256: d9b9d55545af9c1696c284e59ad38df99d5f5d5d40b58513a9b012a48cb60b55
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10532 bytes
SHA-256: e386ad89e4200b961bc12a64624419655012827090b59061357613ff6a3d59e0
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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