Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2813989d2596a7e…

MALICIOUS

PDF

76.5 KB Created: 2021-02-24 18:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: a312b4b328b19bd04b035cedf5d90f02 SHA-1: c8f111aff16dba4d0b21f02f919547bf09bf3945 SHA-256: d2813989d2596a7e05b6b3625c7032795f3aa54b7ef1c5c3582a70b8e40a12f5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute malicious content or conduct phishing attacks. The presence of external URI heuristics and the 'link farm' detection further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/123?utm_term=bryant+furnace+parts+dealer+near+me PDF link annotation
    • http://fusobilel.iblogger.org/myanmar_business_visa_on_arrival_application_form.pdfIn PDF document text
    • https://jazolesapixol.weebly.com/uploads/1/3/1/4/131453041/8e9ca69b4d0.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/covid_19_testing_in_my_area_free.pdfIn PDF document text
    • http://helplnstagram-confirm.com/48389607695b6cat.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/41301688316.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/dual_survival_matt_graham9bgcu.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/5afd0b31b5.pdfIn PDF document text
    • https://domalaxugopomi.weebly.com/uploads/1/3/4/6/134606687/tabasex_muvezisajugewa_pidexupasabidov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favirivesez.epizy.com/adverbs_of_intensity_worksheets_with_answers.pdfIn PDF document text
    • http://kebodilumikida.rf.gd/jojosilabaparunez.pdfIn PDF document text
    • http://disupenepoka.epizy.com/33185350836.pdfIn PDF document text
    • http://riduxipilitaj.epizy.com/wave_tom_jobim_piano_sheet_music.pdfIn PDF document text
    • http://bitines.myartsonline.com/jiterosukakakigije.pdfIn PDF document text
    • http://lexojowal.epizy.com/aube_timer_ti035_instructions.pdfIn PDF document text
    • http://nujowizuwumug.rf.gd/sovopepez.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/65795335611.pdfIn PDF document text
    • http://merojupamen.epizy.com/smack_that_tamil_remix.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/83622966476.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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 5452 bytes
SHA-256: e6370c45087f9face94176124a0c9be2298966084961f487bb3fedd7ff5bc01a
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 11280 bytes
SHA-256: f900e6edb00284f4c825e1136794a9fb3c8970a1a464477eb29f2f91ae5ca376

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