Malicious PDF — malware analysis report

Static analysis result for SHA-256 f764042dc107f043…

MALICIOUS

PDF

81.8 KB Created: 2021-02-15 19:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fde651d6ba2c74e2dd8114315c3cf56 SHA-1: 9f575b46f3c95bf191c8d6b151cc8030da0a9dba SHA-256: f764042dc107f04344b44adcaade4c7a6c7644ab4b4db85de92eb332799b6a1d
156 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 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=biology+1+unit+2+study+guide PDF link annotation
    • https://wemogejivaje.weebly.com/uploads/1/3/1/0/131070934/8059533.pdfIn PDF document text
    • http://yarrebitteh.online/delegation_email_template04b4u.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/xefumakogemubo-jarewipetu-wororujasal.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/jgThbgi/kingdom_builders_ministry_fayetteville_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/JzzifaB/85858952522.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/ja5icGD/25086358244.pdfIn PDF document text
    • http://vulgargirls.fun/bavenebodusendwtz.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/rilisapibenoleseputi.pdfIn PDF document text
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/mobulodeguxawunap.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/6XHzlhc/72219635772.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/rarave_lutoka.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/xomudufe/14464445950.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/visofam.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/angular_material_dashboard_template_github.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/gegowi.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/alien_shooter_2_reloaded_trainer.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/red_cross_blood_donation_parental_consent_form.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_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 5020 bytes
SHA-256: 1319508473e293ad9da2594f0104a869ae03aa2ac0c6693588d3c3b4cb4d1b86
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 10688 bytes
SHA-256: 50f569aca6a0719116d0748dda83b266b9a68bf3dddec424aa9de056f1c47286

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