Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5478f77b193c9d…

MALICIOUS

PDF

74.6 KB Created: 2021-06-01 07:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bd5989b71d5dcebbb5a280a92e26a431 SHA-1: 5fc8b0b0395d1eb823d7b6039b5695b15b238837 SHA-256: bb5478f77b193c9d627c779e694d1c15ea2629b7e6ff9ffd533e93d585cf1eeb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://nipisod.ru/123?utm_term=bottom+bracket+cable+guide+halfords PDF link annotation
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/1810539.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486042/normal_60b4a9a479598.pdfIn PDF document text
    • https://jasenumuruj.weebly.com/uploads/1/3/5/3/135309327/ff934d566b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_6015d7e52eaf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_6024fb74b7318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/490675ea-316f-42aa-a034-9e08cb0ff105/xubapaxemigapulitamini.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/f/download_monster_legends_mod_apk_new_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec18d40-440d-49a6-9b10-f428dfe9dc1f/gugupaku.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/kawasaki_kr_150_wiring_diagram.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144443448/international_journal_of_applied_business_and_economic_research_impact_factor.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144423789/integrated_chinese_workbook_answers_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a39858-444b-4378-aac7-63337ce3217b/tubotakumugenen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed88833-f2f8-4b4b-8525-47d10c34aa42/22242386207.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144414018/72811182760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c351c65d-8ad3-49db-b5bc-58d0ffa97da0/common_core_standards_math_4th_grade_fractions.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/86341846942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c248ae5c-99f0-4d8d-accb-a66085ccf71f/32417916226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba876eae-3fff-4da6-8c50-aaad17690ba4/leraromuwo.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_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 5688 bytes
SHA-256: 336391841f3bd896df3aed4bdba85d2ba720cfa5dd230c85d7e93ea5dd2eb18f
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 11068 bytes
SHA-256: c6fdb7ac9530fa52a289343e8df985dfab62eb9ed1ea475437a119863ee7e53e

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