Malicious PDF — malware analysis report

Static analysis result for SHA-256 5143053e5f2b958e…

MALICIOUS

PDF

86.4 KB Created: 2021-03-09 18:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0eaf11814e11defda8b1b72bae4b3506 SHA-1: 850e6601d3a44be2a7e8cbe8234cf6e3f1d0e4af SHA-256: 5143053e5f2b958eafed45881f965a48afd6424e2012c0af0211fce0f8926364
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=casio+privia+px+120+manual+pdf PDF link annotation
    • http://noturufupama.iblogger.org/vomoxaxuxagikisusof.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/what_does_it_mean_admission_without_status.pdfIn PDF document text
    • http://wibimozuj.22web.org/vuzuduzigizemupadibamij.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/52943863245.pdfIn PDF document text
    • http://zudalipa.22web.org/esv_bible_offline.pdfIn PDF document text
    • http://giocodigital.fun/i_need_to_speak_to_your_manager_gifprpcx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fdbd5a5351eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5fced735d22b1.pdfIn PDF document text
    • http://bridgecommerce.com/dictionary_english_indonesia_free63obh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387046/normal_600212dab8b39.pdfIn PDF document text
    • http://eurosett.net/nutawodupuzarejiwixexig7fado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/bijixitobilize.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_2d7177f4401741b98a4af5605541e007.pdf?index=trueIn PDF document text
    • https://ebf315e8-bd2d-4370-9039-911b8658b70a.filesusr.com/ugd/451461_378e36b08cab4fbc8a18c463643b4099.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_460bd4bff44d4416a101d0269ecffbbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/wivemiboteloxop.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/6414361118.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/bengali_movie_titli_songs_free.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_d3c3c6f449884ca7bb681ccd06d01f4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/kolosukijesusefejewupe.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_1a577bfcc6aa420686cb9ae5a508cc29.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 5548 bytes
SHA-256: 8dd078ddc2112759d83730308f391d7c5476384da34866f11b0318a4f5c3dc86
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 11084 bytes
SHA-256: 3941fdb9e1437e24b07df79668ad7477d2b4ecae50b12e9013167c3deb6e4fa5
font_02_sfnt_off000135e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E6 16232 bytes
SHA-256: 1108fde26526beb56470b911c7e3b1f040da0088942da3a1b45fff1576a9b534

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