Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21d52e1d55f75e5…

MALICIOUS

PDF

73.2 KB Created: 2021-06-09 06:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 66fb461aee15335c41aa3c756123254f SHA-1: 12899cca0985a1184f7876dd83b9cbb0b9fe6711 SHA-256: d21d52e1d55f75e560e69138e8451ccdae73c329d70664f2759f6056f10d52f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded links are indicative of a lure to external malicious sites.

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 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://drafthe.ru/pbw?utm_term=convert+mp4+to+avchd PDF link annotation
    • https://suvoneretalepa.weebly.com/uploads/1/3/5/2/135299969/fde7a0f6b32.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/sofomasiwud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_60334b089b723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_603c747942ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_6066e6a16384e.pdfIn PDF document text
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/fokulenojemizid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_6027395dcd1c2.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/fagimiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5ffa5092243a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_604cb5106a5e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144419778/best_server_for_ark_ps4.pdfIn PDF document text
    • http://risodige.pbworks.com/w/file/fetch/144697728/private_pilot_airman_certification_standards_acs.pdfIn PDF document text
    • http://nowefuro.pbworks.com/f/materi_manasik_umrah.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144907662/mini_militia_god_mod_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8554a0d5-2084-4061-9842-a5a279572332/nabibamobufunutirinemit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52193092-3fee-40dc-8718-8d13cd4b98a6/55661427148.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/hack_mlive_unlock_room.pdfIn PDF document text
    • http://muzurinugaw.pbworks.com/w/file/fetch/144894606/9296994804.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144564105/how_to_turn_off_sharp_tv_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430282e0-5cc6-4c80-b01e-3f807fc48a8b/palme_yaynlar_11_snf_biyoloji_soru_bankas_zmleri.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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 5156 bytes
SHA-256: 0113838c4461a2c5d76e849e5e4d4842e144f95e9b41a9f02134083afe641da9
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10160 bytes
SHA-256: 7275aa280b95559805807e0207ee84af5d505261e3a8f8ab0d31c48abbe056f8

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