Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eafc2a3f67713f…

MALICIOUS

PDF

73.1 KB Created: 2021-02-27 13:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf81d26616e9c30cb2456ffb62e44873 SHA-1: c61ff4c1ae5c8beed27f89643ed5b013249ec9b2 SHA-256: d8eafc2a3f67713f1385693a6d559c1b85fbaa196aff06a0aecead65867bd649
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-farmed, and one prominent link related to 'ethical hacking courses'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

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 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://leonvi.ru/wb?keyword=ethical%20hacking%20course%20online%20free%20training%20in%20hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465125/normal_602963971f0d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_60354302e72ae.pdfIn PDF document text
    • http://ledimpress.biz/affinity_photo_ipad_macrossld48.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/gjjcgcC/29027101643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_60131343c3595.pdfIn PDF document text
    • http://rezltml.xyz/bontrager_trip_100_cycling_computeresh7r.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/ghFibbK/survivor_island_game.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/lWhhgic/monster_trucks_movie_soundtrack_itunes.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/e8f5051489.pdfIn PDF document text
    • http://qqkaxes.xyz/broken_sword_2_remastered_download42q3t.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/rizijubovapuk/motor_basculante_ppa_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/frp_bypass_7_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/jubivedake.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/bittorrent_for_ipad_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/standards_der_global_reporting_initiative.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 5304 bytes
SHA-256: 42c85708c1e8423a6bc6e3b92a28874ec81cd1ea837205b8d866d9dec9f12ae3
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10636 bytes
SHA-256: 3723fc734b8bc34e2b3dc2f1d1a3667201fe1bc144918c70b3e8283d2666faf9

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