Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d36a2b1bfbfdc5b…

MALICIOUS

PDF

78.6 KB Created: 2021-03-28 01:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 28d091a53a4f823669727235d8bcf9a6 SHA-1: c4e406ea4e63e8b31f5c165af462f35548b9f301 SHA-256: 6d36a2b1bfbfdc5b9fd4218b3c9dc3b0d76a6286b2b722e09edb9a2e255ff50f
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 0.9996

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 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://seumenha.ru/award?keyword=defensa+siciliana+variante+scheveningen+pdf PDF link annotation
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/nasesod_vijuxagunuzixed_fuwap.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/21008949160.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/nalebolovatebiz.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/zusiteweberesef_lilurilov_narujidaj.pdfIn PDF document text
    • https://kebetupuj.weebly.com/uploads/1/3/4/7/134733243/9bc47cf379d5d0.pdfIn PDF document text
    • https://namekabesomi.weebly.com/uploads/1/3/4/6/134668803/5809388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/how_to_give_a_compelling_interview_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3ecebe-5f5e-4ff5-aa11-68f48b3433a3/5569473292.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/getozib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a019335-2526-4dd0-ad36-d1c881f58a7b/dynamic_tension_back_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/35627320674.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/30222841237.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/sotojegarurin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e16346-2b9f-4175-88f5-ed5e6beea642/what_is_the_cherokee_indian_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/indeed_jobs_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/boy_scout_cooking_merit_badge_worksheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/78299073052.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/32673778583.pdfIn PDF document text
    • http://dezobod.onlinewebshop.net/skyrim_how_to_join_the_dark_brotherhood_who_to_kill.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/lubixuriwonig.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/wuzagozediku.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/stuck_in_neutral_chapter_6_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 5476 bytes
SHA-256: 6317b2334cda5c701a025ae468a8506ad49207851c53b1110d1d5b11161ceb41
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 12168 bytes
SHA-256: 355392efd94ac1db3ac0d985df63a8e1f891b4bfeb06a2f0d0823e8013142c07

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