Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4690bb0b921dd7a…

MALICIOUS

PDF

75.6 KB Created: 2021-02-25 11:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dd84b456f10c5079b7e10f8e4bdb7a21 SHA-1: 0d7a34cc61e188d8efb4c0519602b0a8babefe3b SHA-256: c4690bb0b921dd7ae2da3f947d68a13046248cc08f1e558db4e20174c72b79fe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to a common search query, likely intended to trick users into clicking the embedded malicious links.

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 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://seumenha.ru/strik?utm_term=what+does+4e+mean+on+a+samsung+washer PDF link annotation
    • http://dreabling.online/76173793984sh5xg.pdfIn PDF document text
    • http://tohld.in/sazidufupafop8m.pdfIn PDF document text
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/powumetonon_pilanibuxavutuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_60108cc7abc96.pdfIn PDF document text
    • http://losqutoq.online/pride_and_prejudice_chapter_summarief3bm2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418567/normal_60044fc4676b5.pdfIn PDF document text
    • http://instapriz365.site/848658143052zduu.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/ZXWyVVi/58756313712.pdfIn PDF document text
    • http://fridgeservice.ru/lazuxom1lrkq.pdfIn PDF document text
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/guwujanumufitafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5ff3b07147308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_6020c4d95900f.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/bmxqNIc/the_big_issue_crossword_answers.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/1641615.pdfIn PDF document text
    • http://sellamorem.com/how_to_change_belt_in_oreck_vacuumzhy1u.pdfIn PDF document text
    • http://eliyalte.com/anna_karenina_livro5dask.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/bejeseja/professional_clearance_letter_response_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/paxuj.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_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 5400 bytes
SHA-256: a9441065718a4525573c23ed3e6d9ee53e8ce89b158057c85a894a0a5ddd6071
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 10244 bytes
SHA-256: 081ec4fb0a786a138de5f31067a95a28e525fab6061ce06dd7f1046499284768

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