Malicious PDF — malware analysis report

Static analysis result for SHA-256 285af05999898ae3…

MALICIOUS

PDF

71.4 KB Created: 2021-03-20 10:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bc837a19f68d376b68b2fdde0f79941c SHA-1: 8bb3d528026ca24f99f81c3a9ff6877930454d4c SHA-256: 285af05999898ae37b777a82b1f640f2051536ea46d34c44fcb8747b38dd02f1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/award?keyword=suffixes+exercises+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/pofaxiniraz/jaSEtGE/electronic_components_dealers_in_singapore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fe37fe701df6.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/cgdjdig/waludo.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/the_hobbit_movie_download_in_tamil_dubbed_tamilyogi.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/eb3baf21917.pdfIn PDF document text
    • https://dutagoloz.weebly.com/uploads/1/3/0/8/130814416/pudigo_wisujuvidixiwu.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/sutedanudelosisaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_60078c9534702.pdfIn PDF document text
    • https://mivojunap.weebly.com/uploads/1/3/4/7/134720575/bafabinetejagitojej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepofif.onlinewebshop.net/plc_programming_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be05f9c-e375-482e-a06c-c2f5e68cbffc/what_movie_plays_its_the_end_of_the_world_as_we_know_it.pdfIn PDF document text
    • http://pimokizogo.epizy.com/banner_mockup_psd_template.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/hindu_baby_boy_names_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371cc691-e3e2-4d85-8f9d-e321fb8be78e/engineering_materials_rk_rajput_free_download.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/64630658106.pdfIn PDF document text
    • http://ropedeni.epizy.com/dipped_products_plc_annual_report_2019.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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 5476 bytes
SHA-256: ede077ec2dba9e90e504eab90429928c3ef53303c54220d8d1dbea736ee99b89
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 9984 bytes
SHA-256: a8180bdf9dbad6207f97fd257d56cf8a906142d4c8bed61e45f22766d68fa6a9

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