Malicious PDF — malware analysis report

Static analysis result for SHA-256 0761ab21cae0c4e9…

MALICIOUS

PDF

81.0 KB Created: 2021-04-07 21:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 56a1c975a17536bf04e9c5fc09aa250b SHA-1: e2af7f18e8cccc830dd3c4181ef4075c10cd022a SHA-256: 0761ab21cae0c4e9dbbaa48e8db82dc769c61c3dcaa2a6f4951a468e7aa8c2e8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://mezovuduw.ru/strik, which likely serves as a landing page for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=restaurante+don+juan+cartagena+colombia+telefono PDF link annotation
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/wuwikelujaxuvij.pdfIn PDF document text
    • https://vabiganivasekeb.weebly.com/uploads/1/3/4/3/134339064/poketizisaminig-paled-zazutuk.pdfIn PDF document text
    • http://useplafond.xyz/parufovlun6.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/cac06710.pdfIn PDF document text
    • http://copyright-supporthelp.com/inventioneers_shark_tank_updateenheg.pdfIn PDF document text
    • http://golivexi.22web.org/edge_of_the_empire_character_sheet_generator.pdfIn PDF document text
    • http://sk-anker.ru/32906899051l27el.pdfIn PDF document text
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/261765.pdfIn PDF document text
    • https://jabipiduluw.weebly.com/uploads/1/3/4/6/134662585/fee9eb1a5c2d814.pdfIn PDF document text
    • http://vykupavto54.ru/435251531845pb38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/593ae908-38af-4a4c-97d6-066c5153bf6f/maze_runner_book_series_summary.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_327413d5a6a04132888fe02deca436c0.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_f501e394c5f348d9be41eed2ab077cf8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d9c6b9-7c74-4a64-9127-eb0454552053/gaxanivoxug.pdfIn PDF document text
    • http://patikogoxuxit.epizy.com/kotixabojobepired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40769c4-6b2a-48f3-bcf0-a56b4eb7e4f9/puladajejexujekusodofi.pdfIn PDF document text
    • http://tubagawidi.epizy.com/zudumapemuwobugise.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 5564 bytes
SHA-256: 304cf6fd3d41553ff39366e82e65e2a3fa52c871f7effd51be8a28dbe4a0d48a
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 12096 bytes
SHA-256: fca8affe74ea7cfed5b7605cc47cf3e03d420b4cacf66ce12ff186f753ec92af
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 16132 bytes
SHA-256: 5df9a924020f3b47f20d23ec22d8572383feb6ad42681b2b1a3175c3053cc5e6

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