Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe058c2f2a5ef514…

MALICIOUS

PDF

71.6 KB Created: 2021-02-28 22:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c44cbd79f92560ddcd43a58d00ce74a1 SHA-1: d6641325d13d9fa1c87128adab8f2b8756823922 SHA-256: fe058c2f2a5ef5148449ae457ffa01cd5c0c83cf3d2a3e8ad9d17e7d3f23c671
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms designed to manipulate search engine rankings. One prominent link points to 'kuzutuzo.ru/strik', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=what+hormones+affect+thyroid PDF link annotation
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/sivixoz-rovefudifosajig-vuzivowak.pdfIn PDF document text
    • http://miniluk.22web.org/does_dunkin_donuts_vanilla_chai_have_dairy.pdfIn PDF document text
    • https://talekadibozevo.weebly.com/uploads/1/3/5/3/135393667/2046832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_600e31f169d81.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/lowurujuzimukis-vivuwobaxew-fadinoluxobo-nesoganinix.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/ec5651b99c3f4e.pdfIn PDF document text
    • https://ravagowezotivix.weebly.com/uploads/1/3/6/0/136094193/zoripajofufi_lejel_gidote_lekoxivomadelum.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/lukepepe/kubofepakewakewob.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/fepoxit.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/ios_simulator_for_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/bizajenemokifo.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/36545332758.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/roll20_add_custom_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/ayo_and_teo_songs_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/love_attitude_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/best_video_games_2020_xbox_one.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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 5344 bytes
SHA-256: bcd6d4b8f066eafa5f515c702163f321b81e489da1f547a60fa84ecbe19dba9c
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 10140 bytes
SHA-256: 13ad87933b48673bbd26727336299e3f5ae00e27f2cdded55f87d186fa361c15

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