Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5f51a318d974be…

MALICIOUS

PDF

69.5 KB Created: 2021-04-19 03:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3f9ef7d8559c8dd468eb289e5e8c4657 SHA-1: 4453b08b7977a09b37a82358665964f961998f3f SHA-256: db5f51a318d974be0f68160d5066ee1cef5116340206f7afe4ca9e0449f56916
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. One of the primary URLs, 'https://resalured.ru/strik?utm_term=libros+de+walter+riso+amar+o+depender+pdf+gratis', suggests a potential phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malicious content or redirecting users to harmful sites.

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://resalured.ru/strik?utm_term=libros+de+walter+riso+amar+o+depender+pdf+gratis PDF link annotation
    • https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/dikebizej.pdfIn PDF document text
    • http://gomijexa.mywebcommunity.org/english_spelling_words_for_grade_4.pdfIn PDF document text
    • http://kegeminu.iblogger.org/22126509177.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/959959.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/13312961994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/what_is_the_meaning_of_surah_maryam.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_4512b04810564fc9bf263bcf10684197.pdf?index=trueIn PDF document text
    • http://ponusiniwanus.epizy.com/anti_money_laundering_act_zambia.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_c76e0b367b144a5d989bed65c4c9cc3f.pdf?index=trueIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_59b1614c0e744704a63ddc824f446fb1.pdf?index=trueIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_74982b42c38145b9aa3d3e85e3cd94a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/47726610798.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_b5bd52081e2d4d1b8e3290caa2a060df.pdf?index=trueIn PDF document text
    • http://femimiwavexu.epizy.com/equality_of_opportunity_in_education.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/listening_english_conversation.pdfIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_0131ff13980041e5a1869e38de615f3b.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_347aeb737a75411bbfc5eb2119ad4597.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_32ea0330ceb64a1b908fa999b03d4436.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_off0000cf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF64 5532 bytes
SHA-256: 3396bd1ae7e1990223b8db6d21c5d8adf23cf01bb6c7f805699a5fd549a4ac36
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 11252 bytes
SHA-256: 64dade0bcd8b04623f61893798c91d01dd6cc062e9712ea6383f354964821da8

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