Malicious PDF — malware analysis report

Static analysis result for SHA-256 c524da5815a4d77a…

MALICIOUS

PDF

74.8 KB Created: 2021-02-15 08:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4205ad8086fa0072e270d8ed4dd2d340 SHA-1: eed239028cba717d199c62b4614c35f4030272ef SHA-256: c524da5815a4d77a85faab4c89c13d7d1d2f14e4b48bb8591c24c61ecf1bef49
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, further supporting a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=drawing+polygons+with+coordinates+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5fe8ff154c9e1.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/dhcGBCs/xironudorosix.pdfIn PDF document text
    • http://xawinagolagiju.iblogger.org/toyota_auris_2014_repair_manual.pdfIn PDF document text
    • http://zomoxesami.22web.org/bnp_paribas_spektra_fund_fact_sheet.pdfIn PDF document text
    • http://dagulofevururuk.22web.org/14887904955.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/cIflXjf/futalukuvifewubuw.pdfIn PDF document text
    • http://vulifux.66ghz.com/adding_decimals_to_make_whole_numbers_worksheets.pdfIn PDF document text
    • http://vatemuredaxusob.22web.org/boarding_pass_invitation_free.pdfIn PDF document text
    • http://bajemafo.iblogger.org/transformare_inch_in_cm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_601b1aa02059a.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonumorawupako.epizy.com/61642779676.pdfIn PDF document text
    • http://pivotigapux.rf.gd/incident_report_vs_accident_report.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/46132776192.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/ronofabofaguxakoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/xijafosafemowam.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/wings_of_fire_book_13_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/rangkuman_materi_un_biologi_sma_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/xifamodaluzatosijilaroti.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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 1964 bytes
SHA-256: 06d927bb2b6daf891478ab4cab90709232d593f7c9b2cc46f53d704c02e6609f
font_01_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5592 bytes
SHA-256: e92c0c34eb3b3124c8de2268d2eae4eedab18ee5f71f5c9503619628603ce806
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10312 bytes
SHA-256: 5525ceaa009c5a5cf08161aff0af45536833dfdb7b4acf4db6a30515349e7213

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