Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b53fb7d9331d32c…

MALICIOUS

PDF

78.1 KB Created: 2021-02-24 15:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 25c17c3f49d9a2cb9a69ce6176427a28 SHA-1: 0ac57afd5af5432944dbfde69a78c8e4e669a1cd SHA-256: 3b53fb7d9331d32cc4fc3d85c3c061e453a83cd9a0536601930d3c49a2ea7f4e
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=how+to+read+math+proofs PDF link annotation
    • https://cdn.sqhk.co/gimenuxot/hwnml54/wijozolixudujij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5fed645c52a47.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/dJpUTL2/famozizomojajaxuvologago.pdfIn PDF document text
    • http://mynasert.online/jogipitqov4h.pdfIn PDF document text
    • http://gravkamen.ru/kubewewagodoleu3.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/ejizWhb/62049179910.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/jgrFShf/pakokaruxeleg.pdfIn PDF document text
    • http://paselon.getenjoyment.net/how_do_i_remove_demo_mode_sony_bravia.pdfIn PDF document text
    • http://tortomsk.ru/70061829523wnfuv.pdfIn PDF document text
    • http://terugate.mypressonline.com/kosivawitakowofib.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/26778055492.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/american_government_and_politics_today_the_essentials_19th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/iBmhjEP/our_solar_system_is_a_collection_of.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/holy_quran_application.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/xakusineba/generate_android_bundle_react_native.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/best_guards_for_wahl_seniors.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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 5300 bytes
SHA-256: b8f55b57ddb2ad95557d77305dea4629c84ad35689fb21d12a2c111113b960a9
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 11116 bytes
SHA-256: 51accecda92d61b60a824510688ec6e4db4dea7d24186396730ef64830e97d11

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