Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3d2b47a1466437…

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 01:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4309055ca97a8d6fc38a7b6f37c32609 SHA-1: b1240c5413316fd1ee24f5273723a254039e86b0 SHA-256: 7a3d2b47a1466437acdd7dd90b5cc27521fff88c6c3a3e2b1255c42033516072
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The primary redirector URL is https://mezovuduw.ru/award?keyword=pneumatic+hand+drilling+machine+pdf, which is likely used to deliver a phishing or malware payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/award?keyword=pneumatic+hand+drilling+machine+pdf PDF link annotation
    • http://stroymarketmetal.ru/dobunatigejanaxotuw8znx.pdfIn PDF document text
    • http://winoraama.website/81991126282fmxnf.pdfIn PDF document text
    • http://astrology-personal.online/madudupuzenenasutazoxukifuumjn.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/maths_aptitude_test_for_class_8.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/wudigejevoped.pdfIn PDF document text
    • http://tomogorman.com/bcom_marketing_management_jobs_in_south_africal6l5m.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/josobezupipufib.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/soduwu.pdfIn PDF document text
    • http://pugaxokip.22web.org/tawunuxusajadufus.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/pomaxa/secretarial_audit_report_of_reliance.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/seismic_monitoring_in_mines.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/87478872921.pdfIn PDF document text
    • http://kegaregajisojas.rf.gd/answer_sheet_template_1-200.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/hy_huanyang_vfd_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/28877642132.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/good_answer_to_job_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/disclaimer_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/implosion_game_terbaik_android.pdfIn PDF document text
    • http://fijazuzid.rf.gd/free_nonprofit_business_plan_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 5392 bytes
SHA-256: ebb56bfc763312a4cfabf2ab8f85c38ee3cb8accab674cf446860312576bc437
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10800 bytes
SHA-256: 2139b6116c737ca67577b98c65350125ed31376bce9de50b08b78acb02855bf7
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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