Malicious PDF — malware analysis report

Static analysis result for SHA-256 824f9db85132a0f5…

MALICIOUS

PDF

67.0 KB Created: 2020-11-14 16:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a382aed54523febc9b8a170cc9a11560 SHA-1: cbf0b07b59d3bce5c640fcf640a0cd6c64bd316e SHA-256: 824f9db85132a0f513f95e03c9ad1630762f12d36c198d4880c0ec7bbd3145f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO abuse tactic. The document body mentions 'Avast cleanup premium como cancelar', which is a lure to direct users to malicious URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

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://traffset.ru/123?utm_term=avast+cleanup+premium+como+cancelar PDF link annotation
    • https://guxikotazo.weebly.com/uploads/1/3/4/7/134704652/7e31588f8d8d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fad3660b264f.pdfIn PDF document text
    • https://pusojavinobaz.weebly.com/uploads/1/3/4/3/134353251/1106984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5fa1b60bb7c61.pdfIn PDF document text
    • https://bakurisevujukuj.weebly.com/uploads/1/3/4/3/134368754/palezaxazi-xekiv-nujiturijab-muvukixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5fa3c30fce307.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/dedinavesute/31876399445.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/jesus_teachings_on_love.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/distillation_column_calculations.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/wireless_mobile_battery_charger_circuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfeb868-db47-446e-b5de-9b7ab424b893/72137922971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25f9a4c-c666-425a-aeea-a2d9b82a4ed2/xalero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f38e69-957c-4f8a-84fa-a594ce9f7826/nawinejorevuwulenef.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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 5128 bytes
SHA-256: 034bb496bdf01160ab7beb355852064b85a3be678177d8504acecdbd089fdd03
font_01_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 9620 bytes
SHA-256: 59419cb7b928583f263bc07a885d2d2bf153609761ab8660058dd67bba073160

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