Malicious PDF — malware analysis report

Static analysis result for SHA-256 19527d38e7866ba5…

MALICIOUS

PDF

66.4 KB Created: 2021-04-15 10:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d79cfc1c9b58c241f6c43ac9c185c630 SHA-1: 1236855551639e71048b257e7d76da5266df880b SHA-256: 19527d38e7866ba5d970e4287f9ab7a0aa146361fd0bbf6bcafd03937e6bcc1a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

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://botokaw.ru/strik?utm_term=g+shock+rangeman+replacement+strap PDF link annotation
    • http://testvvd.xyz/11603937921lwl7a.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/busepejasogajudi.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/rhg5hiU/galaxy_watch_3.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/80d825342a.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/vazoloma.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/xhcDmhh/fuzakuv.pdfIn PDF document text
    • http://just-gopro.com/troy_bilt_horse_bolo_tinesjcuxc.pdfIn PDF document text
    • http://apkweb.net/36135936474806k8.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/tugeraxo7aerj.pdfIn PDF document text
    • http://luchdobro.site/what_is_the_purpose_of_north_atlantic_treaty_organizationmzak5.pdfIn PDF document text
    • https://zovafizi.weebly.com/uploads/1/3/0/8/130874114/megowepuxulafaweri.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/jbijrjb/47601798207.pdfIn PDF document text
    • http://voiprormul.xyz/chocapic13_shaders_1._8._9m4xz7.pdfIn PDF document text
    • https://cdn.sqhk.co/fejipotegevi/OgidhfD/68903281868.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/appropriate_preposition_for_competitive_exam.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/fzijfWZ/24456017035.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/rafufudiwafozejebutiravu.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_bd456d3622dc4a8195a993f12b0bdf9f.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_3b2218c1af4044f9906b236c4299c1f1.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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 5444 bytes
SHA-256: c1e11938eb04078eaa752207a1597afc2019c28f574fa225ae1f18d31646c93a
font_01_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 9988 bytes
SHA-256: ef1c4a24d7497acfb06e842dcaf565288a9cbe9967f4c56efa85b7eaf0034919

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