Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaaa637e1bb417a…

MALICIOUS

PDF

73.0 KB Created: 2021-05-09 08:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7454591845a25605f20b3b8f952362f8 SHA-1: 2a98a3d561eb1ade8c7bd93a7bbfba04077bcb58 SHA-256: 7aaaa637e1bb417ae2f98aa2dc5a1fc0a69bd16d105992b5019f11cc08d11204
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The embedded URL 'https://jacksth.ru/strik?utm_term=how+to+replace+a+trane+thermostat' suggests a lure to a malicious site. While no scripts were explicitly extracted, the PDF structure and external links point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+to+replace+a+trane+thermostat PDF link annotation
    • http://xoxuwupoganolo.22web.org/77725355979.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/wall_street_journal_subscribe_student.pdfIn PDF document text
    • http://hookup157.fun/sun_mountain_micro_golf_cart_accessoriesc51tg.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/VQBgjgj/19082101344.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/fghM1he/infinitive_spanish_definition.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/tezuzerise/IaiiijB/soccer_world_cup_winners_by_year.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fLoQu3y/cute_free_ringtones_for_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/eNbgg10/46100090713.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/sample_application_letter_for_any_vacant_position.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/athdjeh/44630108897.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/is1Q2bS/samurai_2_vengeance_1._1._4_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/hdhgOgd/64359395825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivaxodi.onlinewebshop.net/calgary_barbell_16_week_program.pdfIn PDF document text
    • http://mukowepefirufeg.epizy.com/bofamofolikikoz.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/muscle_workout_chart.pdfIn PDF document text
    • http://rufokafujiza.rf.gd/appsc_panchayat_secretary_previous_papers_with_answers.pdfIn PDF document text
    • http://pixagikaw.epizy.com/wipotomepijopejijazav.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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 5224 bytes
SHA-256: 6cfee5d995bba074e098dc2649509eefd7a78b8465d76203ba08edbc72273353
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 9668 bytes
SHA-256: d05e7b38cffa190ad37f9cd0b3246658e78dc7af6e314967cba1c23cc1be163d

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