Malicious PDF — malware analysis report

Static analysis result for SHA-256 355fe4326b6a0305…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 16:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ca5c85eafd359ccab35a5da70b1e747 SHA-1: 7bd6d07fbc5e50431f704218c9a6494287d38568 SHA-256: 355fe4326b6a03059946e462c241e48bccea17a9975b1f9d84c1017b8395c005
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent link directing to a site related to 'college courses'. This heuristic, combined with ML and ClamAV detections, strongly suggests a phishing or social engineering attack. The presence of external URIs and a link farm on disposable hosting indicates an attempt to redirect users to malicious content.

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/strik?utm_term=college+courses+to+become+a+real+estate+agent PDF link annotation
    • http://gavepokuni.22web.org/problem_solving_techniques_in_business.pdfIn PDF document text
    • http://rolevuses.iblogger.org/ccna_cyber_ops_lab_manual.pdfIn PDF document text
    • http://gratoramaa.website/53514685372jnumf.pdfIn PDF document text
    • http://medway24.com/lomotibubegefurezajogudumqctih.pdfIn PDF document text
    • http://duvesawolaxu.22web.org/vafutoxib.pdfIn PDF document text
    • http://fowujuli.iblogger.org/29629126080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasosurid.epizy.com/amphibole_crystal_form.pdfIn PDF document text
    • http://sisawujeza.rf.gd/legejazumifesuruduras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9004446-d425-4b40-9f75-f91ac0e87e16/51965663752.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/salvation_army_donation_guidelines_furniture.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_61afaff3373c40348bc0f20cb346ffac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/447339f3-15dc-4a1d-a3a3-be16f91bf751/what_are_the_operating_hours_of_the_stock_market.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/nutuwenuvusivoma.pdfIn PDF document text
    • http://xewenofos.epizy.com/iready_answers_level_e.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_454d156c8e3f4ae89f01850e40589c01.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_9e9f1c947f194bdd841d0a0611f3c767.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/surah_yasin_dan_teks_indonesia.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_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 5164 bytes
SHA-256: 084aeaced2125a80b3f9e83125da2e6aab218277b84310bc913f77a0ab27468b
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10948 bytes
SHA-256: 57ff859416854326dbd72ffe21ca8122b19423c0441697fea5a88dcccb06fe39

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