Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5957a5e0d671766…

MALICIOUS

PDF

75.7 KB Created: 2021-03-17 19:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cc430f15cd8ef5676efa14bf0a4dacc8 SHA-1: 1921205fc84ea9e632ae02dec85a086313f5659f SHA-256: b5957a5e0d6717666edb06b87eaf70f26967ba9a8507981c8aa43acf5f9c5da0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm designed to obscure the true destination. The primary malicious URL identified is 'https://leonvi.ru/wix?keyword=mopar+nationals+2020+grand+bend', which is likely used to redirect users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=mopar+nationals+2020+grand+bend PDF link annotation
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/lonogenaja.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/1b5f01d44e.pdfIn PDF document text
    • http://meetlait.pro/buwitelunomuzl2az4.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/vodipu_razejeku_tufiduzifape.pdfIn PDF document text
    • http://tersq.fun/simms_injector_pump_manualdbhws.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/240832cb-7ff7-41f4-a711-581ce0ae19c4/72075300838.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_43edd92170a84a1c9e66aef77485f0a6.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_91832e47845b454c82e7c52ee08f71b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jakujakula/body_parts_worksheets_for_second_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/63563432067.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_b98a012eb7c64811bb9ee035584feaef.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_aa144244aad04e84b25214394613aa6e.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_c1adab21cdab4ab4955e52be0f84a3f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07161115-5b54-4f04-a9bd-091817148faa/prayers_that_bring_healing.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/cover_letter_template_business_administration.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/budekofovekulijomejedaxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c513790-dc59-457f-ab40-5fd55075afd0/ganana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e743168-139d-4e03-994b-daf9f9e65168/46530649072.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 5548 bytes
SHA-256: 3572adfd7ad9c6ffca7b8a5fe3d195e0d93de1a90442697cb11a490821c6093c
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 11036 bytes
SHA-256: 31f49e921a280f697090a63c09529684189979268d6eca996511b4ff068a0ac3

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