Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe155a883c9c49…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 06:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce48c9b6831a036ee8fd4fb7c22806d4 SHA-1: ec4f6e94ef0972da5d4f6bb016983606f18143a6 SHA-256: 0cfe155a883c9c4987f61c83b27f56c4e2b82843f378317eba3b2a32f7b4e139
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the document is designed as a link farm on disposable hosting, likely to phish for user credentials or lead them to further malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=gravity+piano+sheet+music+john+mayer In PDF document text
    • https://juramezuvuro.weebly.com/uploads/1/3/5/9/135956704/2828892b5a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_602072c688736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc5c906e3b4f.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/sizutivol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_604e565710ba0.pdfIn PDF document text
    • http://bedanixabij.22web.org/intimate_apparel_store_st_paul_mn.pdfIn PDF document text
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/654078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5fd9b46240fa4.pdfIn PDF document text
    • https://xaxusadusu.weebly.com/uploads/1/3/4/4/134497069/390ed7e3e308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476148/normal_6027fbe43b0fe.pdfIn PDF document text
    • https://pozanabuloga.weebly.com/uploads/1/3/4/3/134366917/kituvezuro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390328/normal_5fdcf9906a942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6018335710d68.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://uploads.strikinglycdn.com/files/65856d3b-0822-4166-802d-68093c0357bf/mr_coffee_coffee_maker_bvmc-sjx33gt_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/nunozuxavulubojupafejej.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/72374097311.pdfIn PDF document text
    • http://sujetolus.epizy.com/nbte_curriculum_for_hnd_business_administration.pdfIn PDF document text
    • http://rurigizibafazuk.epizy.com/what_is_the_average_salary_for_software_engineer_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d89b50-2f7d-4db3-ade2-8f7e5f203050/the_prayer_of_jabez_bruce_wilkinson.pdfIn PDF document text
    • http://voruluju.epizy.com/pu_foam_sheet_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8502f63d-5a04-4176-91e8-78ef6eac53ff/sonegofixutitobibajax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c9eb8e-6a43-4964-af9d-a65ac6640719/libro_de_los_sueos_tombola_santiaguea.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/vebexedodukejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/how_to_repair_pallet_truck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642f221b-2b00-4f25-9a04-339850b84009/gosinanapo.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/13246985486.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 5292 bytes
SHA-256: 557ec4ad135ef8fc7b9b6a1f4ce6c1abc27600f0aa154440783a9f301e6de6f0
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 10696 bytes
SHA-256: 2c2686f4e1c9a5eef047599ada32c802ef88d45202e6c9287c8217ef553019cc
font_02_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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