Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b23d66b6088536f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-05 18:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bad0c0b82cb008f301a2fb42a0745bef SHA-1: 86362e78f71ebe55ba343c490321ecfa179d2f6e SHA-256: 0b23d66b6088536f8f8067ba9e35f9c1e3d460b5ca747a69a460de79fdc8caf9
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various external PDFs, and specifically employs a 'Browser extension / update installation lure' to trick users into installing potentially harmful software. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xajibur.ru/aws?utm_term=selenium+webdriver+example+test+cases+java PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fe30ebb10227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_6019d18bc33ac.pdfIn PDF document text
    • http://alkostore.xyz/5457742924293ta5.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/19496773620.pdfIn PDF document text
    • http://lidzadva.xyz/77063393243sjezo.pdfIn PDF document text
    • http://filfex.ru/55219004945tt18i.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/al_quran_recitation_mp3_free_download.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/pivavugatilarud.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://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_88b49a11c4a247f080c9a2e4d838dc9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e749dde7-d76c-47d7-8e17-068f68717812/woxodejekoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b505a9-ea61-4ff7-960a-a6c868adc6c1/45219685707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33b6f5e-42e0-41d5-be99-f2ffb490ea05/julius_caesar_act_5_scene_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2693dcc-e8b9-4de2-b120-38891d2c584e/dufudoweritoneralijerake.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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 5528 bytes
SHA-256: 60ee01c655c3b63382be826a34669a853e9fa6bc07cf322690c8bb265bda7639
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 11364 bytes
SHA-256: 45f132b3004dc0e8c773ff7cfe9e1919016a24ac9da0d5e05997d3482d4dd72e
font_02_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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