Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50ed473d7758534…

MALICIOUS

PDF

75.7 KB Created: 2021-04-15 03:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4e00974a9977fb0248861737a771b547 SHA-1: d58493a0c1e7ac54db78153e87a0344a63591120 SHA-256: e50ed473d775853449afdb9d1fe90387536c93087034adab251fd9d2284985fd
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://kuzutuzo.ru/strik?utm_term=what+are+three+most+common+research+methods+used+in+social+psychology PDF link annotation
    • https://cdn.sqhk.co/xalesikozip/gPjiUhh/hide_navigation_bar_android_8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/jbW3gje/zulijogalun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416496/normal_5fef0ba5ddb7b.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/fhfwSQj/storytown_grammar_practice_book_grade_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460708/normal_5fe2d5e74675a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fc9decbc5866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452148/normal_5fe0104d1952c.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/xumakomowi/nomuba.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_f6711dbb5ebe44cfbca82fc57602f2c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retisovojor/tifodigopune.pdfIn PDF document text
    • http://vumesurev.epizy.com/gedosoriroveburefuropoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/pubupagopojasopazakelo.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_838327aaa8d741c0a889badf806c7d7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kafises/les_aliments_riches_en_potassium.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/top_10_best_bollywood_movie_site.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/sitenavediwawowaxivan.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_2c1a5c91bf424cb6ad66b5b2be938158.pdf?index=trueIn PDF document text
    • http://vusizudufekope.epizy.com/13994418661.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 5600 bytes
SHA-256: e3ce4c2ca0516139f300d577ef89bdf21a99a6e4ded15a35dda66fa2ea39c8d8
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 10620 bytes
SHA-256: dead377c04d610bb5410f1985f3a949dfe60e9055e23dc1bca022c05a44ae2ea

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