Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b4c6e1e0ca18d5…

MALICIOUS

PDF

84.0 KB Created: 2021-05-31 23:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e616bf1f62944dbce11d15fb601cab7d SHA-1: 14ba0724a0815aa53253d34e0d8a3eff36ac3590 SHA-256: 47b4c6e1e0ca18d5595fffa0de8177d81e3b0811b55779d144917f294ccc5375
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate potential for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/pbw?utm_term=la+casa+de+bernarda+alba+english+act+2+summary PDF link annotation
    • https://bikopevi.weebly.com/uploads/1/3/4/3/134391393/be2038dce44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411700/normal_5ffb76e83fa4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383573/normal_5fe4b76880fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6049ef440e884.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/a8a667d51a6.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/bffad7a1a2.pdfIn PDF document text
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/2226427fd.pdfIn PDF document text
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/pixojukodufubux.pdfIn PDF document text
    • https://vojawafi.weebly.com/uploads/1/3/1/6/131636668/3fc7b3119d27.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/e8391419-ac4d-43da-a75b-71d82b73dd68/wimpy_kid_movie_diary_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d936078-27ab-422a-9701-57279944f2c8/korukagupuxazuw.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/68949923709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa87e13d-ce0a-4198-aa82-4aca4812d7fd/8489549833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba68bff-2fb6-44f5-9192-4f70c2fd7165/ielts_writing_task_1_answer_sheet_idp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e0f024-8af4-4d63-849a-80142186da9e/how_to_charge_apc_ups_1100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d526cbaf-5867-47da-b6da-26ae9e5630ae/mugep.pdfIn PDF document text
    • http://xawaren.pbworks.com/f/44385990619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf52085d-f0de-4887-940c-da7e20ca595f/replacement_parts_for_frigidaire_gallery_dishwasher.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_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 5440 bytes
SHA-256: 0cb515d2f0e5fa3d37c6b0ebe3c7251c74dc59a8c65fede3135e819c50349733
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 9944 bytes
SHA-256: e0f8e8a2e762ae593a6a49655ea48eafb7c8d902e757cf0d908157022ec7b178
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34