Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a259ded4f86593e…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 11:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9d220b093ab80fc75920ea6efa781244 SHA-1: 557559ad4adb736fb1e87b76c379c121ef18b305 SHA-256: 1a259ded4f86593ef25ec6fef4fa66f3c2144564e893ef4efa5fe60faa174aec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme. The embedded URLs point to various PDF files hosted on services like weebly.com and s3.amazonaws.com, indicating a potential distribution or redirection mechanism. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://jacksth.ru/award?keyword=bootstrap+4+sass+tutorial+pdf PDF link annotation
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/3350264.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/oIic6ig/rinis.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/BgdAgfK/goxeninibidijukixigila.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/sefiwabivo.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/efjeLjk/1844917759.pdfIn PDF document text
    • https://vuvoxuwamulixa.weebly.com/uploads/1/3/0/7/130739220/matuwiranafa_biwedewef.pdfIn PDF document text
    • https://dilabugesoko.weebly.com/uploads/1/3/4/6/134627797/wumakidoji_maxovewaretep.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/6468929d.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://mizilugodipibo.weebly.com/uploads/1/3/0/8/130813887/9476236.pdfIn PDF document text
    • https://minovenuk.weebly.com/uploads/1/3/4/3/134306780/doparen.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/93AKcic/riwupazexejexigifujaxiz.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/f3d7627.pdfIn PDF document text
    • https://soneputud.weebly.com/uploads/1/3/1/4/131411150/wuwafuzuvesa.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/fatisake/functional_training_workouts.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/nepaluzosaxowukedewojudaz.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/50035664503.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/pro_guide_kassadin.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/ascii_format_means.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/credit_score_report_india.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/management_information_systems_degree_description.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/what_are_the_two_versions_of_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/91443683221.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/canada_employment_insurance_reporting_phone_number.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_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 5172 bytes
SHA-256: be37c502d3b124e5f274c686057e6dfd9f1ebcbbe98ceea10b7546c401333d05
font_01_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 11700 bytes
SHA-256: b1804d1a3d50d72b0c148664c695965c5a048524bb5945cf71afbd1da0e2a07f

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