Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1903d29a27a40ab…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 09:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9581a14675d5ecf6f2e49b243b309b69 SHA-1: 524f44b18af5bd9a26da459b34fe037b6dc7ee74 SHA-256: b1903d29a27a40ab54eb0f97139d3c036ec80194c1a7d85d25b341c196b40da2
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 domains and are structured to appear as search results for educational materials. This suggests a phishing or malware distribution campaign, likely using the document as a lure to direct users to malicious sites.

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://jottigo.ru/wix?keyword=sadlier-oxford+vocabulary+workshop+level+b+unit+11+answers PDF link annotation
    • http://teachost.com/what_are_the_4_basic_principles_of_the_declaration_of_independence57yrf.pdfIn PDF document text
    • http://itverys.space/idioms_worksheets_3rd_gradew1wp5.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/african_bank_loan_application_form.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/60464992601.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/muxutuxabez.pdfIn PDF document text
    • http://kimisorunutom.medianewsonline.com/crossfit_workouts_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/icifbDF/tarapom.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/iiiFgf8/men_s_adidas_x_star_wars_ultraboost_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopisumeku.atwebpages.com/dyson_ball_animal_2_upright_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcd971e-300f-4a89-8d10-a164ba779507/fakud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeeb134f-9330-4275-a9f9-2994c2b84c19/rexug.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/ruwinefokatefimoponisowad.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/advantages_and_disadvantages_of_tourism_essay.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/27903112051.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/tubiben.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/financial_audit_report_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 2900 bytes
SHA-256: 9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 5956 bytes
SHA-256: 394f9c140837a804844a67b896b358bf9a70ad2d904ee21d45c84a574e1bd706
font_02_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 10760 bytes
SHA-256: 98c40528ead664880d34ad8272996ddef3286811559c552eb38e4addcbafff5e

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