Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c73f336f9d84a18…

MALICIOUS

PDF

85.9 KB Created: 2021-03-18 18:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 060fe7f7cd088170c215cc24a4e448cb SHA-1: 5248cce74c127331a7db961b98d3f3e02fd3ffbd SHA-256: 5c73f336f9d84a18de13e551a72d6f07ea765a6be9b4a6aef93dea3342cb61ce
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=ap+psychology+chapter+8+learning+study+guide+answers PDF link annotation
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/0e0842.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/jesesiponemar_veziraf_sikikuseteretip_zugatapawukupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_601eb550d05b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491173/normal_603554d971ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448750/normal_600bca55adbc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_5fe39fca40409.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/2920412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_602ec260ba4ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43658a9e-65cd-4601-bcb0-9cb4b12422fd.filesusr.com/ugd/7ab50f_4ff58b1d3b96450a95d6eb1ab74c641d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/name_sheets_in_excel_2010.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_7354375545f043a9b0e13a231bcbc06e.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_5b72fdcbd02c42508bc38022bb91efae.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_3d11566e4bf243ee88148fc019341052.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/discount_on_bonds_payable_balance_sheet_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/renuwasezoxutevewufilir.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/53932138232.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/borchers_platform_bed.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_e84536cb34fc4f02aba8e663d7b89ed3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/how_to_play_multiplayer_goat_simulator_on_xbox_one.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_f8b6a48cdd254beb90dd384757f538e2.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_b43a8a5671e244e1a0828f83384d9ba4.pdf?index=trueIn 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_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 5712 bytes
SHA-256: 6c7b3d9496131b2479303bbbd657fc308f28b88d4be257fb39245811bb38b2b6
font_01_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 11032 bytes
SHA-256: 7b9c562bf84963ece17e30f0d78fad67a444d873a716ab7117bcce2875801a2e

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