Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d87292ea4cb0144…

MALICIOUS

PDF

94.0 KB Created: 2021-02-28 17:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8b9c927c9085fac21ee09bfb8be5826a SHA-1: 87942fa8f08f3e838a4c5ae2242016e444462a82 SHA-256: 4d87292ea4cb0144904e4257f9cb94b46e5cdbf5f3d46b53f54b6cf51bc1680a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate a potential for malicious redirection or content delivery.

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/wix?keyword=patriots+james+wesley+rawles+pdf PDF link annotation
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/9527260.pdfIn PDF document text
    • http://itfamily.info/dafemomepikadapip2r0mm.pdfIn PDF document text
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/nunuvabize_pamadunaxasejar.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/parrot_in_the_oven_summary_chapter_5.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/how_many_employees_does_macys_herald_square_have.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/25537983943.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/tixexavovakobozewiwopuge.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/english_grammar_with_tamil_explanation.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/storcenter_ix2_download_software.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/pegesozisap.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/e4f7a9337bddb.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/1153488.pdfIn PDF document text
    • http://dlkmvkoenv.info/61062474920sqyj.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/do_air_purifiers_have_washable_filters.pdfIn PDF document text
    • http://apparentlyopt.com/samsung_series_5_5003_led_tv_392gcvf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/50826689803.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/95845905333.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_off000133ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 5456 bytes
SHA-256: 696a9e750f1293c1dd54a0d6ae24476ee0d89ff8c3beba97cd27827433f7b44b
font_01_sfnt_off0001464c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464C 10536 bytes
SHA-256: e46fbadd29de432a99a9f4a21e6f86d959adc5ed7dc0755213d50c908c91b342

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