Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dd38b2a78704bb…

MALICIOUS

PDF

89.8 KB Created: 2021-03-31 22:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 793c989dd654bdd689f6dc36c8d71bab SHA-1: a9150bc679fe3abefa022b9eddb8cd08ade00ba4 SHA-256: 65dd38b2a78704bbfab225a7577e76463983a7f4658ec9caebad32f58af2ed27
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The primary malicious URL identified is https://kuzutuzo.ru/wix?keyword=to+kill+a+mockingbird+final+project+newspaper, which is presented in a context suggesting it's a search result for a book project. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

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/wix?keyword=to+kill+a+mockingbird+final+project+newspaper PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453338/normal_600de1c9cc0fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_604930dee7b07.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/sipowep-zegoki-fumaxaxawirusiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fd19fe20cc2f.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/how_to_print_digital_paintings.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/nugixexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_6012630a93c6b.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/jeromisixinolib/bmus_sor_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/subometamibaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830a0419-39c7-4ed1-936c-178ae0e16a26/17628228167.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/41400528606.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/botagimewudas.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/wuzigukuwigunozowabokoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b18ceb9-906f-4625-8a64-c91603db2747/computer_programming_for_beginners_a_step-by-step_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04c5390-de48-471c-b38d-efc806006220/56018447841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f093033c-066f-4d7b-8f4d-ac61773df77d/gypsy_moth_caterpillar_rash.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/61439332703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bf9629-7ca2-47f3-8602-b59f876e2e39/bafadufasenuwepileg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701c1c57-b18c-4537-acba-cfa8e35c2c77/92640234333.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_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 5796 bytes
SHA-256: d231d5f7a10405216a4d9b0f5ed0fe8b9e8b540b146251251c894dc08a4a19a9
font_01_sfnt_off00013440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 11008 bytes
SHA-256: d33fe04f91ac8a2abbb8fc3bc209a90a6dca3eaa5989dd0763ecc4d43ff5f88d

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