Malicious PDF — malware analysis report

Static analysis result for SHA-256 74befa86ed3a73e0…

MALICIOUS

PDF

82.0 KB Created: 2021-03-27 19:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f8808345ba70c1313cad000a837e1a5f SHA-1: 5046c545beed505d1ebf186227b6ded243334669 SHA-256: 74befa86ed3a73e0fc4f07ebbe7a7a6a970bb1f665b7ceb74e17abcad3cce772
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=no+lag+shaders PDF link annotation
    • http://calipshatngaccs1.xyz/information_retrieval_vs_information_extractiony7v0m.pdfIn PDF document text
    • http://lokusenikuxole.iblogger.org/79137297937.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/types_of_discourse_analysis.pdfIn PDF document text
    • http://ideaita.fun/solved_questions_on_residential_statussebmk.pdfIn PDF document text
    • http://salonop.xyz/behringer_eurorack_ub802_review4gnjh.pdfIn PDF document text
    • http://roskycnmx.com/aapka_ghar_kahan_hai_meaning3n8tt.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/29663209531.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/born_a_crime_chapter_1.pdfIn PDF document text
    • http://todayit.pro/antiepileptic_drugs_classificationnevnf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/769096e7-ed8d-46f9-b2f0-d6b1e00b4c91/first_alert_explosive_gas_and_carbon_monoxide_alarm_error_message.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_d0484ce33e324ba08bf1494ed515b7f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/nagumisekegibolotoro.pdfIn PDF document text
    • http://denitotogu.epizy.com/26489872527.pdfIn PDF document text
    • http://kegigija.atwebpages.com/15262991079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff828a94-a275-4076-93be-c944978f4a63/verbos_irregulares_en_ingles_espaol.pdfIn PDF document text
    • http://vuxawov.rf.gd/44103047593.pdfIn PDF document text
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_b7863a42ccc9407aa725b7679ae9edd0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/72478279248.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_bdbfa37ce673406499bcff0988c262c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/15026256708.pdfIn PDF document text
    • http://tijiwef.epizy.com/wuvovasewaripusatodu.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_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 5056 bytes
SHA-256: bb5a4dc85a8732845ce3761a0891eef25ca208556ed49537f10029455a4c5851
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 11692 bytes
SHA-256: 7bf99d17e795bd5ec72b8f903664524113c4f0e60e5ef32d276eee7d6575f738

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