Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae42e5e223d4eeba…

MALICIOUS

PDF

87.8 KB Created: 2021-03-14 14:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80702aa93c7068dde5215b8ec7821070 SHA-1: 22625ddcc23cdbfa0bd695d2f3633fc65ee96db6 SHA-256: ae42e5e223d4eebaaea39c3982ca5ab2ee0af73b09f04b22f7178059655b5280
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is jacksth.ru, which is presented as a botany lab manual. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jacksth.ru/wix?keyword=botany+lab+manual+class+12+hsslive
    • https://cdn-cms.f-static.net/uploads/4470552/normal_6034da952790b.pdf
    • http://lnstagramcopyrigtservice.com/1977_dodge_motorhome_fuel_sending_unitasfkd.pdf
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/xitiruru.pdf
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5ffdd37df242b.pdf
    • http://5-euro.info/tuxubezidag5bc3.pdf
    • https://cdn-cms.f-static.net/uploads/4366676/normal_603ee573de1ac.pdf
    • http://pitushok.space/32783133504q3b10.pdf
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/nezigobokisa.pdf
    • https://mepowisa.weebly.com/uploads/1/3/4/5/134595914/bcdc536477ff1a.pdf
    • https://static.s123-cdn-static.com/uploads/4381551/normal_5fee2e74bacce.pdf
    • http://natorg.fun/wubopatarejegikqb3.pdf
    • https://cdn-cms.f-static.net/uploads/4487632/normal_602b43232735b.pdf
    • https://fusewexe.weebly.com/uploads/1/3/2/7/132712136/buvotupomobu.pdf
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/5186517.pdf
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/869213c9873.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/84994478380md1yp.pdf
    • https://cdn-cms.f-static.net/uploads/4447251/normal_6026865a8f2dd.pdf
    • https://daxuvevirub.weebly.com/uploads/1/3/4/0/134013438/botedinowibi_kubeso_guberi.pdf
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/degulujo.pdf
    • https://cdn-cms.f-static.net/uploads/4463263/normal_6027216901d41.pdf
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/518350bd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e8dfffa-cf5e-4616-824a-7be8eefc852e/nilobebagarure.pdf
    • https://uploads.strikinglycdn.com/files/f636edc9-ffa7-4751-8f70-b54dd02d8a67/where_can_i_buy_vampire_diaries_merchandise.pdf
    • https://uploads.strikinglycdn.com/files/85f5bdc0-7e29-4c47-807d-dd80c53a8b57/best_2d_animation_apps_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/4dbc34a3-9b74-4244-945f-4519780cd94c/rifts_rpg_dimension_books.pdf
    • https://uploads.strikinglycdn.com/files/76aa1405-450b-4238-84dd-d8e6b6135983/how_to_write_a_sales_book.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_off000117ae.bin
eb35a84d7358aaa849b6938d2ff4ef5f6b7cdf0696f0ef43764f6fa5f067aec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 5476 bytes
font_01_sfnt_off00012a42.bin
14564a4cfb0459886fcc25b674553f0abb4869f610a18efb3aa05fbb55205d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 11352 bytes

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