Malicious PDF — malware analysis report

Static analysis result for SHA-256 6209323fdf17585f…

MALICIOUS

PDF

76.0 KB Created: 2021-02-11 20:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3f912bab4764637b39ef92a4de781d25 SHA-1: 7239902fb669e4b7b6808218f4f9d0ecacca056f SHA-256: 6209323fdf17585f0bd1800d4010fc3b5fbdfd3d839da283cca86b076ab59464
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identified it as a PDF link farm, with many external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting 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
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/123?utm_term=compound+words+that+start+with+news In PDF document text
    • https://cdn.sqhk.co/lanamixese/ciey6gf/wupafaze.pdfIn PDF document text
    • http://arnautmebel.ru/tomasemelules81uh.pdfIn PDF document text
    • http://italysummer.space/vimokuribemezafulimuxu56nxa.pdfIn PDF document text
    • http://covid-19online.site/jeep_cherokee_limited_2014_owners_manualfgs2a.pdfIn PDF document text
    • http://bas-vorota.ru/19351109810tvk3d.pdfIn PDF document text
    • http://ryukzak.digital/download_internet_speedtest_by_ookla_apk380d7.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jahg1VP/line_connectors_javascript.pdfIn PDF document text
    • http://dirtygirl.fun/modal_verbs_worksheets_for_grade_65mf55.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ZIjgGge/24844283352.pdfIn PDF document text
    • https://jaxowukijov.weebly.com/uploads/1/3/0/9/130969500/pudem.pdfIn PDF document text
    • http://generalmassage.online/anouilh_medeapwwtb.pdfIn PDF document text
    • http://giveaway2020.info/schaums_outline_of_physics_for_engineering_and_science_third_edition57gx4.pdfIn PDF document text
    • http://naturalgood.space/gaxutugesoza6yko6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/gopavopuvupamof.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/bushbuckridge_local_municipality_database_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/dj_bulbul_bhojpuri_song.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/93389525220.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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 5164 bytes
SHA-256: 924d0fce4d1ee1ff8f433fa134e6119d11c806b716840c1799d3591bbd7cbd2d
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 12640 bytes
SHA-256: 18d3541b94c9647b2ac19fabc8c6ad22d336ec733a828ad830cfc5bcc541bfb8

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