Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f9ce87b44df8ca…

MALICIOUS

PDF

82.0 KB Created: 2021-03-11 12:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1b03894afa4a9ad697895eac3297e48d SHA-1: 20f64dd7e89fc3d26726d93e88f3de066f1ab24d SHA-256: e3f9ce87b44df8ca718b3c0b62c16ee3c77bf30b569e51ec750c4b2f2c4e9fe9
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for phishing or malware distribution. The presence of URLs like 'https://golowaki.ru/award?keyword=adobe+pdf+reader+free+download+for+linux' suggests a lure to download software, likely malicious. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://golowaki.ru/award?keyword=adobe+pdf+reader+free+download+for+linux PDF link annotation
    • http://nexofozupugasi.mywebcommunity.org/brand_authorization_letter_format.pdfIn PDF document text
    • http://espaceabonnes.com/phone_manager_pro_downloade3gff.pdfIn PDF document text
    • http://sokfresh.fun/jowomifanetanozorion4e.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/that_will_be_fine_with_me.pdfIn PDF document text
    • http://pipvip.ru/gegonesugefadagac9kgt.pdfIn PDF document text
    • http://karma-911.com/9396251702d661v.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/new_beauty_products_october_2020.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/zovuwisedebapit_luwuguda_fiwomawa_kixoxegavoz.pdfIn PDF document text
    • http://botefin.medianewsonline.com/woodcock_anarchism.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/apprendre_a_lire_une_partition_de_piano.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/danukaxijuz_kidisufo_tijijigufarip_guzikaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_cbdfc9d744e449bd8e5577ec99629723.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3656d2-9f78-4c5f-a927-33ebc95c7013/livros_espritas_grtis.pdfIn PDF document text
    • http://jupegojut.atwebpages.com/fusifada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dacf39e-c810-48f1-be60-1920c11865f8/over_the_rainbow_judy_garland_movie.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/absorption_chillers_and_heat_pumps_keith_herold.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_de057c635ee5475a9ec161d5ea0021e6.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_05d4648abec24c48aea1c224965e934e.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_68e0287236ca4dcea3edef95b388024e.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_7795e60418d64ba4964073c47567968c.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_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 5144 bytes
SHA-256: 0b1b9bc3fbf44a47bd3f09d88141b8ef623866b99d403a4c34e6f9e965bbc0d3
font_01_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 10896 bytes
SHA-256: 15160d3c2a80ca0d59278f97dbc2e2ac2585863b62530d66616c2865375fd142

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