Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd7f7ff866b77d9…

MALICIOUS

PDF

77.3 KB Created: 2021-02-24 07:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d9c8636989938109ac5334a7c32c75dc SHA-1: 39e87b1192efdad4f011f3dcd78f85e8fa56df68 SHA-256: cdd7f7ff866b77d94dad5ae39bee8267014c85b0894e74ab2b24e824aac74f37
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=autores+de+la+letra+y+musica+del+toque+de+bandera PDF link annotation
    • http://bigpleasure.ru/izotope_ozone_8_manualegh60.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/29655370192.pdfIn PDF document text
    • https://jemexegotida.weebly.com/uploads/1/3/4/4/134464186/sekutoramavoxutafij.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/2xrjidQ/cat_simulator_animal_life_mod.pdfIn PDF document text
    • https://niladituzisum.weebly.com/uploads/1/3/4/7/134736231/wewudin_malewi_bagumujefep_mekazido.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/ada998cbe5012.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowatu/ijghbYu/craftopia_gameplay_trailer.pdfIn PDF document text
    • http://teachersaid.fun/xolujofezapugisx4vp5.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/D2gfzPJ/green_poop_mean_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/PDgcO9j/basketball_game_live_score.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/8535163842oatwg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fcc28f5a8fdc.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jueehdD/nodogenezisodijik.pdfIn PDF document text
    • https://jezaxinadi.weebly.com/uploads/1/3/4/5/134597346/vatuzuzan.pdfIn PDF document text
    • http://akfb.online/jenis_astigmatisme9ciwq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizepojuduw.rf.gd/letter_format_for_internship_in_hospital.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/engineering_drawing_notes_for_alp.pdfIn PDF document text
    • http://diguneleg.rf.gd/nawuvurejikonogilenefiwas.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/the_coenzyme_forms_of_niacin_include.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/fatca_reporting_model_1_iga.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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 5444 bytes
SHA-256: fbf6f7f104a43afb9791efbdd99cf0345a87ab4fe4af7f826e3e2bc13bdadcaf
font_01_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 11588 bytes
SHA-256: 20741e24d096b8a8b34a9373b570ca5346b0a721fad12cee7e53906af215d66e

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