Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8dc73e22abee86…

MALICIOUS

PDF

84.5 KB Created: 2021-05-25 06:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d33e44dc337aab94abfdb7fc4d4f2522 SHA-1: dd1079cef19c4dfa6fd37da5f31c0586c2672ecf SHA-256: 9f8dc73e22abee86df37873701d9d80d3566036cad15d77f4d1a8524b9cc3f53
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://zajinet.ru/strik?utm_term=e+w+kenyon+books+online PDF link annotation
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/cb095d.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/geketexumi_dowefumewekekeb_lukegijolilaba_xabowixim.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/lipezuximenuvim_fusewojisazuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_60465d0523ce8.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/b29f87a27d.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/5486839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_602f5a03ee7bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5ff47c793c600.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/nijosinizo/how_to_use_bayer_contour_blood_glucose_meter.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/15972880340.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/beatless_light_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/printable_shape_tracing_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/chihuahua_mix_breed_information.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/guwawumebatefiw.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/99272019643.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/kuxiselugifefogudukuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/garfield_kart_apk_1._1.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/5222896908.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 4728 bytes
SHA-256: 2ca6844cadd1982723b18083a225a4633278a9e39aa8e3e37a6b4023188ebbba
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 11388 bytes
SHA-256: c955d316c65a804938e3e22ef02c42685c8d87fe32ea6ce5e191d359f642a449

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