Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc70d3b915970021…

MALICIOUS

PDF

74.0 KB Created: 2021-05-25 04:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258fd8d32cd75bbf1cf93eb49d656628 SHA-1: 7bb14eaf2f1ab8ec452ce9f6d85ac3043e2c6fe4 SHA-256: fc70d3b9159700218a03b1ed87e92ca27130114b3f7d7b826b3686b383935676
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used to deliver a secondary payload or redirect to a phishing site. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=define+dysphagia+in+medical+terminology
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/f6bba0414bb5.pdf
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fe029f2aad3f.pdf
    • https://zobuboralol.weebly.com/uploads/1/3/4/4/134487340/1906546.pdf
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/poruduluvuvad.pdf
    • https://static.s123-cdn-static.com/uploads/4381294/normal_5ffa196ce17ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vibuvomomuv/best_spreadsheet_for_monthly_budget.pdf
    • https://s3.amazonaws.com/xijalovelokolep/36966387364.pdf
    • https://s3.amazonaws.com/vavabi/kjv_bible_free_for_iphone.pdf
    • https://uploads.strikinglycdn.com/files/b131f5eb-fa5b-43c8-b4c1-3bbf7248a516/28183848529.pdf
    • https://uploads.strikinglycdn.com/files/170b2e0a-9085-4d6b-8daf-cc14a060724b/8155949078.pdf
    • https://uploads.strikinglycdn.com/files/35d3f88b-5811-4790-9cf9-43424a734fe7/53_bank_auto_loan_login.pdf
    • https://s3.amazonaws.com/sitok/wigudazubowarakijap.pdf
    • https://uploads.strikinglycdn.com/files/ebd67718-3f2e-4ae7-80f5-7d4c780b2a66/botiwesosafowopafalov.pdf
    • https://uploads.strikinglycdn.com/files/401dee9c-80a8-4451-958c-458e93fbd3f6/jalaxorudolubusoduk.pdf
    • https://uploads.strikinglycdn.com/files/dc82f2be-6f00-4604-a9b1-8eef314c8c05/gobefire.pdf
    • https://s3.amazonaws.com/zufojadibi/78679623505.pdf
    • https://s3.amazonaws.com/rubidokezive/book_review_outline_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/a7b6434a-ac25-4892-b565-ad24deea313d/food_dehydrator_drying_times.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def9.bin
356a78c732401b25eeb820ac990b26e6e6219c7e3df52480890f5e6fca06e608		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 5672 bytes
font_01_sfnt_off0000f234.bin
c2071cc882a96a94ceb967a72eb19ca1ff8b293e22cc39124fc8fe5c08706d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 12104 bytes

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