Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e55c18b673e836…

MALICIOUS

PDF

81.3 KB Created: 2021-03-29 09:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6c0873640ddaf9a7fa5991ffda847fa9 SHA-1: c5aa0488e3afa2165afae4a6e0405c39ac5ae705 SHA-256: f4e55c18b673e836ebf130c7579a9ab4f7a68846c55c3a4654729e75400b161e
184 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 one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to installation instructions, suggesting a lure to disguise the malicious links. No scripts were extracted, but the presence of many links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+install+parmak+solar+fence+charger In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_602c897555c03.pdfIn PDF document text
    • http://buxuzexutotuf.22web.org/how_to_read_a_scale_ruler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_60377d85cbf0c.pdfIn PDF document text
    • http://fejelomixariji.22web.org/yusuf_ali_quran_audio.pdfIn PDF document text
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/5614164.pdfIn PDF document text
    • http://fedogiki.22web.org/farojizovirolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_6051098975f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_5fe93b2d2960f.pdfIn PDF document text
    • http://nusukopov.22web.org/hey_there_delilah_instrumental_ringtone.pdfIn PDF document text
    • http://rakedotizem.22web.org/irobot_roomba_i6_6550_robot_vacuum_review.pdfIn PDF document text
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/xolebaralub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_6021bf5c5ea8c.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/51277458648.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/kyocera_printer_drivers_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadomorepizof.epizy.com/jaxegesuzugabat.pdfIn PDF document text
    • http://dajejumu.rf.gd/kujupaxedajaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/pozululobulozome.pdfIn PDF document text
    • http://mirimanomuropa.rf.gd/35172837403.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/kabutenuzagasugomedipaziv.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/how_to_say_no_to_being_godmother.pdfIn PDF document text
    • http://kulebosux.myartsonline.com/la_biblia_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/90236847780.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_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 5548 bytes
SHA-256: be2be35f8b07d67810cd8398ab7fb7a91d3f2a878f8e784c6710b0e515af59ba
font_01_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 10832 bytes
SHA-256: 815061fbf11975d1331aaf9df84c5262ecd3e767253f95b9125ddd18a3cb9d31

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