Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc3d1c9be3e44b8…

MALICIOUS

PDF

161.3 KB Created: 2021-03-15 05:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e76075bc8b5d1c206239f51dc458358 SHA-1: 9c8079742887a5785a3e4410d7d5503b7ac62178 SHA-256: acc3d1c9be3e44b85b4243cea19b608d2e6122e2e896f890f07e1c48740260a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

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 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://vilenefex.ru/strik?utm_term=svyasa+yoga+books+pdf PDF link annotation
    • https://cdn.sqhk.co/ragejeli/jeGmggn/vudufivoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_602b61082e551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_5ffa6ad123d84.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/nihgh6p/free_streaming_news_channels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_602ad03002e73.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/56226352004.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475985/normal_5fded6a4a0010.pdfIn PDF document text
    • http://gigezesuzobe.getenjoyment.net/2762541362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fde3be72600e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fe8468b9f47b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosedosoxibi.epizy.com/makefasanunozirezorus.pdfIn PDF document text
    • http://kerepokomodas.epizy.com/grade_8_math_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/3_point_likert_scale_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/tenufuvunowizazo.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/shanta_bai_audio_song.pdfIn PDF document text
    • http://regufowes.epizy.com/should_everyone_go_to_college_stephanie_owen_and_isabel_sawhill_summary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000215a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215A7 5552 bytes
SHA-256: f0fe823839715f8918f006cd1a08500ca1586efe8bbe8309a13391c4b39379e8
font_01_sfnt_off000228ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228AD 2544 bytes
SHA-256: 8c1be5a94ffa9a755f346f8711c0ef9a6e46f1d53167537678e3b41dff0c6c3e
font_02_sfnt_off000233e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233E6 14180 bytes
SHA-256: 0505bd30ae99b1089a49564dbf7ee6534c4ec7a6afeec0eebe023e5d436c56e7
font_03_sfnt_off000261db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261DB 16256 bytes
SHA-256: c9e07f1f889c10d8f246ea3b699927788e4c8f8981ed8776328facddf0b0cbee

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