Malicious PDF — malware analysis report

Static analysis result for SHA-256 594031c6fde71e69…

MALICIOUS

PDF

87.4 KB Created: 2021-04-09 01:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3aa7f08278483e44d5b30a38e1e401b6 SHA-1: 3f0fa5ccf93a47b3d77c009db00bd4ea633d8300 SHA-256: 594031c6fde71e69b642c4f18252cc2e68be7fc5585de9bc0361626400570c54
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Edexcel igcse chemistry student book answers pdf', suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://midufefew.ru/strik?utm_term=edexcel+igcse+chemistry+student+book+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5ffed35ba011c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fefbac352764.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/gshbIhe/stickman_dismounting_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/hcp2Cka/polandball_germany_work.pdfIn PDF document text
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/0f8967311fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_6065c61f1b9b6.pdfIn PDF document text
    • http://reweder.site/kelunodupprzge.pdfIn PDF document text
    • http://airet.space/kodogoqi1h.pdfIn PDF document text
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/28181cf87d.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/blue_theme_song_320kbps6gwfp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_602ee207dc450.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/35511295649.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/female_bodybuilding_workout_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_605d1b232a624.pdfIn PDF document text
    • https://josuwolirekovu.weebly.com/uploads/1/3/4/3/134305593/7339729.pdfIn PDF document text
    • http://soxudenuwunala.22web.org/folubuzodozumuxelifan.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/muxurironazasidanazubas.pdfIn PDF document text
    • http://pressit.fun/dantes_divine_comedy_downloadizgjs.pdfIn PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/sinesefivogusenog.pdfIn PDF document text
    • http://summ-green.fun/sri_rudram_namakam_kannadan5g0b.pdfIn PDF document text
    • https://luxefelukij.weebly.com/uploads/1/3/0/7/130775337/2d9f87ae4a0320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xobebol.onlinewebshop.net/best_virology_textbook_free_download.pdfIn PDF document text
    • http://vegewamofuxa.rf.gd/excel_template_for_paying_bills.pdfIn PDF document text
    • http://bojilukirifep.rf.gd/rogevanetexunep.pdfIn PDF document text
    • http://xalenefinuj.rf.gd/unqualified_audit_report_philippines.pdfIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/maxazap.pdfIn PDF document text
    • http://lonopisok.epizy.com/new_headway_beginner_test_book.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_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 5872 bytes
SHA-256: 9bf64ec28eed6725a07f4304d7852e13002ee2577be0644d768f0e90c9cdd839
font_01_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 10996 bytes
SHA-256: 0297ee5b6f1f83320bba471f861a70e03a86e361e2f69baeeeee79ffbb5d32a4
font_02_sfnt_off0001416a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34