Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ade1fb754a4a27…

MALICIOUS

PDF

86.9 KB Created: 2021-04-04 15:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ef126e2ab4c4d85f3148ad6c184ac023 SHA-1: b249c1a9ea58fcf1624f5f4b44c368254b672f1e SHA-256: c7ade1fb754a4a27922452780d85a2b5a9e713aa52bd0fcf689c8ae692d30c38
186 Risk Score

Malware Insights

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

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 0.9997

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://botokaw.ru/strik?utm_term=drills+to+teach+5+out+motion+offense PDF link annotation
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/9185713.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/7c37pAy/vebanavaxotojijaxut.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/ieidyPa/othello_act_2_summary_shmoop.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/hfqhcif/wartide_game_download_apk.pdfIn PDF document text
    • http://sadovik.me/gavulukugujolxm353.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/object_oriented_system_development.pdfIn PDF document text
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/1115258.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/3186482.pdfIn PDF document text
    • https://cdn.sqhk.co/sebelokili/M2iirjr/business_card_design_app_apk.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/biwemivivumegaduxamujepo00wu3.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/raruroxilijadumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_d6c317d565ef4d8aa6e6dfd82888eea1.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_0c014082955845089ae3ca26ea3e5816.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_f76b21976e034983bd7a6acb426994b3.pdf?index=trueIn PDF document text
    • http://lufiwivumijej.myartsonline.com/airfix_model_world_june_2020.pdfIn PDF document text
    • http://zilisidojaze.myartsonline.com/conjuntivitis_bacteriana_caso_clinico.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_12ec0f7d0a854e4895a6f8eb3ff22c64.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_8bee3ebcbcf542c3be799a51a8f88d40.pdf?index=trueIn PDF document text
    • http://samesesodore.onlinewebshop.net/print_html_to_python.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_05445c6578674a3d82175c389e5df384.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_71d937b469ee42dc824b197fb46054b9.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_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 5244 bytes
SHA-256: c9c9b0dfde6950d3b5e735ffc59ad976946f8d13d65768fd0258df516c3cca89
font_01_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 11252 bytes
SHA-256: 8b034c68d18b1167e86ce69ad3ae5e30285ef89b1312f66b6bf387fef93c92ec