Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c6ac3916ffc883…

MALICIOUS

PDF

69.6 KB Created: 2021-02-17 00:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7a5a2522e99d7220f1bb222567f4d25b SHA-1: df14c979c8b91af4e4b16330ccf64b98a2019c9e SHA-256: 42c6ac3916ffc8833c8969ed513ddc18630bb9b6409fed9e9206311582f91ef8
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to a school calendar. The presence of numerous external URIs, many hosted on disposable domains, indicates a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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
  • 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://baarspo.ru/wix?keyword=masconomet+high+school+calendar PDF link annotation
    • https://cdn.sqhk.co/pobojatizopa/a2jhchb/91223909869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_602488ebb65f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60244dade1f26.pdfIn PDF document text
    • http://migajipanijezep.22web.org/how_to_use_countable_and_uncountable_nouns.pdfIn PDF document text
    • http://tepepowaz.22web.org/cercle_de_la_forme_diderot_planning.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/WYOFbfK/norine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_60174dd621ad8.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/fEFEjgy/jolukupe.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/icjaigj/machine_learning_meaning_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_600555ff7345c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5fd791df51690.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/kubernetes_nginx_ingress_log_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_601421141efe5.pdfIn PDF document text
    • http://zamividiwido.22web.org/pawenux.pdfIn PDF document text
    • http://wofeboz.66ghz.com/zokokalidelufadenu.pdfIn PDF document text
    • http://najapizarut.22web.org/gavenuviworavasutupubozaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fe545a4003bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapizof.rf.gd/nda_confidentiality_agreement_template.pdfIn PDF document text
    • http://zumepif.rf.gd/38287355907.pdfIn PDF document text
    • http://suwojubomitela.epizy.com/bombay_movie_songs_ringtone.pdfIn PDF document text
    • http://lenevetu.rf.gd/colts_injury_report_week_8.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_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 5356 bytes
SHA-256: 0947efed4f6fe8c8c4f38cbc24a675617d85288f5abc29e8ae4348b5815acc21
font_01_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 9924 bytes
SHA-256: f9f64e0b79a84bcca8b171165a7dbc8daa896ea7e7a00355602abd8ca22716b8

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