Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51efcf9f761e6f4…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 17:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b865e58306de6b0847273e3ea6cea47f SHA-1: 6746287fedf5ebe73f3ee40edcd1f64e04d14df6 SHA-256: d51efcf9f761e6f48c946964b154089c2010d26efbe2187b2f69300199614b02
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://crophysi.ru/123?utm_term=mevduat+bile%25C5%259Fik+faiz+hesaplama+form%25C3%25BCl%25C3%25BC` is likely the primary lure, disguised as a financial calculator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crophysi.ru/123?utm_term=mevduat+bile%25C5%259Fik+faiz+hesaplama+form%25C3%25BCl%25C3%25BC
    • https://cdn-cms.f-static.net/uploads/4413118/normal_602711ebdcaf4.pdf
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/mazus-wofefamumageto-pejaviwoma.pdf
    • http://bowuvudofi.scienceontheweb.net/vugaxoxanapebuz.pdf
    • http://reduslim-siteofficial.site/interview_questions_tips_and_answersjlv2k.pdf
    • http://idealicaitalia-official.site/ccleaner_portable_latest_versionboe5q.pdf
    • http://duxinivodozular.mywebcommunity.org/19839248406.pdf
    • https://cdn-cms.f-static.net/uploads/4479223/normal_600f572e5b218.pdf
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/xageketes.pdf
    • http://kamini33.ru/mitorafn5vi0.pdf
    • http://manamuposa.getenjoyment.net/81698115659.pdf
    • http://powerhdniy.space/diwolhmr2q.pdf
    • http://gufutaca5.xyz/adi_handloaders_guidebiav1.pdf
    • https://static.s123-cdn-static.com/uploads/4484635/normal_6004e7d483f43.pdf
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/vasogovemu.pdf
    • https://cdn-cms.f-static.net/uploads/4443608/normal_6039db368fc83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f16a7323-8e95-470b-a37d-19b2dcc0e78e/56756695555.pdf
    • https://uploads.strikinglycdn.com/files/c500da45-1ce8-47d6-a527-8774cdc71611/cfa_level_3_curriculum_books.pdf
    • https://uploads.strikinglycdn.com/files/acfe11b9-1f02-40e7-b959-351452aa8ec7/intellij_maven_spring_mvc_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/275a7013-b21c-4a13-939c-de6f66ac5e7e/tojom.pdf
    • https://uploads.strikinglycdn.com/files/b063937e-e1b9-4272-b09d-66eeaabd0a98/76649013812.pdf
    • http://jupevesu.atwebpages.com/64480120429.pdf
    • https://uploads.strikinglycdn.com/files/499233d8-da67-43f6-b7cf-33ad96a642ce/mikuni_carb_rebuild_service_uk.pdf
    • http://wokidomogu.onlinewebshop.net/barycentre_terminale_c.pdf
    • https://uploads.strikinglycdn.com/files/78189d18-8752-461c-b8db-a64459a5dac2/58159409157.pdf
    • https://uploads.strikinglycdn.com/files/06185b9e-ab9c-4d94-acf0-6eee0ab41377/technical_analysis_and_stock_market_profits_by_schabacker.pdf
    • https://uploads.strikinglycdn.com/files/85d134a6-37ce-4c14-8bd3-23e2158238c2/funuwajakaziguge.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_off0000e927.bin
f578cc5f896f884e6588ab910f9f2844d658047ea95cc5296ec40849d7bb9cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 5968 bytes
font_01_sfnt_off0000fcab.bin
526ef08af67d49ad1133bc9475edc6e1435f8586cec7c80d9318a56705315fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 12356 bytes

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