Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0050018b49f2cf…

MALICIOUS

PDF

90.9 KB Created: 2021-02-23 17:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2fd0808311748a4ed331601a6d8cffd4 SHA-1: 0b113af9d2bff8d512932035a9e526425a2b7ef2 SHA-256: 5b0050018b49f2cf4f43d14f6c8e2aa3dcdfbff9ee410f5ccfe60f32cd33390f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/strik?utm_term=pasos+para+preparar+un+bosquejo+biblico PDF link annotation
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/wofudilu_kotubazasemaroj_titave_relijuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb0a8636012.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/bedofuvunew.pdfIn PDF document text
    • https://semuvobe.weebly.com/uploads/1/3/0/9/130969465/fikipavabev_jafitopomuroziv_pogafum_vezojego.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/pufofakujokuzid.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/d4773ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_6014915397e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_6018bd61456e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_5fd62f3f130f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_5fd841cca9795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_6005f8ec31b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410983/normal_5ff8590c7b1a4.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/gebefuvis.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/kifutizijebuj/ecological_succession_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/rowinizipezanisabarikinod.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/karidexuwadanikovawikid.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/loxijusuzusapijolofogojex.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/kadupadav.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_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 5268 bytes
SHA-256: 6153da49c36f171b551b449357a1dae823cef618ca7cde8968bc738a480a3c56
font_01_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 11532 bytes
SHA-256: 382ac9fb42a093861f826db907d95733e0ea99083eceb25ea843380624aa59a2

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