Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e451b60c39bb01…

MALICIOUS

PDF

79.7 KB Created: 2021-02-11 15:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1912596c8308ccd2825e1dbf5432f2dc SHA-1: 4aae56737195585f538b58fd41d497beee0d4239 SHA-256: 27e451b60c39bb0102abc210e4f65ce254fea3120e987c975533742d6b2c936e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest it's designed to exploit users by presenting deceptive content and leading them to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/123?utm_term=georgia+department+of+education+gifted+resource+manual PDF link annotation
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/689182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5fd06aea3b9d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5ffccf6f9eaee.pdfIn PDF document text
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/8083433.pdfIn PDF document text
    • http://comp-arenda.site/44109918857jc8st.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/490817fff3.pdfIn PDF document text
    • http://vandify.com/bintang_kehidupan_setia_bandk04ed.pdfIn PDF document text
    • http://bufizuz.22web.org/lezaboxasuwewefokew.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/8713910.pdfIn PDF document text
    • https://gazikurow.weebly.com/uploads/1/3/1/4/131452893/9969567.pdfIn PDF document text
    • http://autocredit.moscow/ti_dragon_city_hack_2020_apkggwc7.pdfIn PDF document text
    • http://poradoit2.site/86077467492cycw7.pdfIn PDF document text
    • https://cdn.sqhk.co/gupidiroka/oijdzbU/run_fun_3d_adventure_walkthrough.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5fe40e9749ed5.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/mefonevimimix/dbt_house_activity_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/free_printable_ay_sound_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/acrobat_reader_gratis_em_portugues.pdfIn PDF document text
    • http://nosifunugiwes.epizy.com/46341997625.pdfIn PDF document text
    • http://zukanimi.epizy.com/abandonment_notice_uk_template.pdfIn PDF document text
    • http://tibobabinenan.epizy.com/22395657365.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/genodosibodalukule.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_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 5508 bytes
SHA-256: af24b7fa1fd97477558a9eec7ba700efabd52a5a5bac3a0de867559b6f248849
font_01_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 11236 bytes
SHA-256: 42dfe9146489a66861cd7d7ef41b783f204a7448e773259eb4ef996704dfe828

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