Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5761c5dd68a26bc…

MALICIOUS

PDF

103.1 KB Created: 2021-04-14 05:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: feb181e03caeb49c6ecb89c4a7f9cee1 SHA-1: b099e43b400ca23475d3929738f07b57a4ab8a2a SHA-256: d5761c5dd68a26bce3d2fae8c6b4e08b7b964c87bb9376b41127bdfda799d080
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a significant number of external URIs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=monsters+vs+aliens+nickelodeon+dailymotion PDF link annotation
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/liwawexebopire-mubewodifov-sizufelaxuzuja-zudibopiv.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/8946e0731.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/devakuwovefufexaf.pdfIn PDF document text
    • http://vezdesami.ru/pump_flange_size_guide5zxiu.pdfIn PDF document text
    • https://bezulagoxirupaz.weebly.com/uploads/1/3/5/3/135347250/keroxoli.pdfIn PDF document text
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/8c624.pdfIn PDF document text
    • https://jamudavepavu.weebly.com/uploads/1/3/5/3/135324372/novupanu-pimagan-dozal.pdfIn PDF document text
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/zijiro.pdfIn PDF document text
    • http://avlto.best/brazilian_jiu_jitsu_moves_for_beginnersauibn.pdfIn PDF document text
    • http://twenty-promo2020.ru/zuxokexetu53q2k.pdfIn PDF document text
    • http://insta-sale.site/dreamweaver_8_old_versiondemw0.pdfIn PDF document text
    • http://nikecortez.net/robabikeduzadogiripodogy1vsm.pdfIn PDF document text
    • http://ipatovaalena.ru/crank_ellen_hopkins_free_onlineot4qu.pdfIn PDF document text
    • http://springwin.space/microsoft_excel_questions_and_answers3b06o.pdfIn PDF document text
    • http://it50save.info/how_to_use_cricut_design_space_with_expression_2jocyy.pdfIn PDF document text
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/4595799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_ea104fc0655346cc8d45214dc7d12feb.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_7efed104439a4fae9eee65758d60bfb6.pdf?index=trueIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_dbe6288d86384f8d92d405f73bf510e5.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_c7021908266243dd870a65f02263eb62.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_0821922b539d4921823c8e759da0d727.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_98ffbfdc3fc241cf9a0a0f7ecea9adca.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_d04409acb7fe45118d6405b1c0b6f3dc.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_off000157cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CC 5316 bytes
SHA-256: 5391211715aef653bfa54b1a670f93d0842d0884c366a6cf927216b0422237f2
font_01_sfnt_off000169e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E3 10716 bytes
SHA-256: 08115ad702586d347997bc8cba90b08756812d2cac1c69941fa5451648a530b4