Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf4873482431426…

MALICIOUS

PDF

76.2 KB Created: 2021-05-08 01:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 574f716884c77934ac78ddd20ba7d5c6 SHA-1: c10c8c5f47838351ff46cd81a5430a2112f1a57c SHA-256: dcf4873482431426bd4eb8ea29d3c9207c5abfc1d0a0b66502310aeab9773936
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=alkaline+diet+food+chart+pdf PDF link annotation
    • https://vizifeji.weebly.com/uploads/1/3/0/7/130775372/6f1ca107e40.pdfIn PDF document text
    • http://xoxanuf.mygamesonline.org/25284406367.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/eichmann_in_jerusalem.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/772726.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/consumer_buying_behaviour_research_paper.pdfIn PDF document text
    • http://jujabadoko.22web.org/csf_function.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/tagagefu.pdfIn PDF document text
    • https://degezikesobito.weebly.com/uploads/1/3/1/3/131384018/0f37e7.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/bemumemubag.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/wunadudozukan.pdfIn PDF document text
    • https://lugonejiborin.weebly.com/uploads/1/3/5/3/135336075/5dcef.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/ropidadegaxut/whatsapp_app_2018_install.pdfIn PDF document text
    • http://koxaxoboxuzir.epizy.com/how_to_bypass_parking_brake_for_dvd_player.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/11308382481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2788dccb-77e9-4040-bbfd-1726ff1058e8/kigupegezugufokiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5caaa2-595d-44d6-aadd-33cf77e67f7e/the_quran_is_a_sacred_text_of_which_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/fort_s_defense_crossword_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed452da-4c0e-4cfa-bae0-1de5e9d29d77/half_blood_prince_snape_scene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424bc9c8-0799-4d45-8676-9cfeac544434/how_to_troubleshoot_my_samsung_refrigerator.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 5116 bytes
SHA-256: 4c89b685178542df4c222511c5e049b8e3422ed873a87901d7b6e874ca34b619
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10652 bytes
SHA-256: 2dd468fdf1c3983cedc5be3b9aeed2c5a64e7ca19eb05a2f0741c0d7bd143b36

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