Malicious PDF — malware analysis report

Static analysis result for SHA-256 66be53946dbdda5f…

MALICIOUS

PDF

150.3 KB Created: 2021-03-22 15:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa2f3b2a573e435b9a86d37e56d1be7f SHA-1: 5f89b584407b274b048cc4e8380b5bcce5333935 SHA-256: 66be53946dbdda5fdbd206c4cdbc6dce8533fbc4e8b1c4b9b3773e1d4c8bb5ae
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 0.9998

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 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://mezovuduw.ru/award?keyword=prevention+of+domestic+violence+act+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446275/normal_5fc9e691586de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427821/normal_5fdc2097cc01b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fe805a8193bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5fe1e9240ed04.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/gi4geic/bileiklerin_adlandrlmas_sorular.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/j8HIgjt/49703522725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_602f4b088b7c9.pdfIn PDF document text
    • http://mogitumo.iblogger.org/sibamexetejelabopejizaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5fd94e649618a.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/saziwijaxodav/54304905042.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/36529808312.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_815e021204e24d2b880a2a06adc17c1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/how_to_use_vanderbilt_assessment_scale.pdfIn PDF document text
    • http://gorevifero.epizy.com/marvel_comics_movies_list_imdb.pdfIn PDF document text
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_ffc6f294adaf4fa4b58238687c079ecf.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_c3e2817c3e204f3ea91722e2b25462d3.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_e3065d03b4e948e69d7ce8ca130dc68a.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_e3aaa07332934478a9c060ba3b757704.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_off0002106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2106B 5636 bytes
SHA-256: c93dd86f17c809f581b7da0a6cb854779756e60d407ab656864d994f93a11e40
font_01_sfnt_off00022388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22388 12044 bytes
SHA-256: ba78cd31c5f8f9e36cb94b9e4d7a9f76fdb960278ad39711442d560debeb3f2e

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