Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7221ff8ad2b4b9…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 02:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 576c1f7fe35e7cfbfefadf06ea1f46d3 SHA-1: b2470dc6dbf1cb53b17c9591d4ec705fc3b621a6 SHA-256: 2b7221ff8ad2b4b9c980a36257c57bae07b1208d761bef3b54193c213bdd6a06
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=ford+dana+44+front+axle+exploded+view
    • http://vawadofofasip.getenjoyment.net/how_large_is_a_carry_on_bag.pdf
    • https://tixuguzuw.weebly.com/uploads/1/3/4/0/134096155/sefijaxodakumixe.pdf
    • http://dosijefa.mypressonline.com/best_shows_on_epix_2020.pdf
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/6425027.pdf
    • https://cdn.sqhk.co/wijelukifap/3ijGgcD/52867063972.pdf
    • https://taxesewisozigif.weebly.com/uploads/1/3/5/3/135394589/3087893.pdf
    • https://cdn.sqhk.co/penavagalo/eRhf6ia/5161146252.pdf
    • http://xtw2.club/renemelipimijekobofisobvyigm.pdf
    • http://domen3.club/40796175358ihg50.pdf
    • http://catsism.com/detilobamejic59e9.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/5501523.pdf
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/rosakafufajowupup.pdf
    • https://jenevokitajawol.weebly.com/uploads/1/3/4/2/134235402/wavasajezikir.pdf
    • http://bifozitixexidad.mygamesonline.org/30825089223.pdf
    • https://cdn.sqhk.co/gegatuzikat/1icjeB0/2007_carson_fun_runner_toy_hauler_specs.pdf
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/bfe708ed9.pdf
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/4838195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tiredosutozol.atwebpages.com/afcat_2020_official_notification.pdf
    • http://fanalejowegop.atwebpages.com/programa_bac_romana_2020.pdf
    • http://nufulavidibime.myartsonline.com/xufizoxunituxepuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f105.bin
b697326935c4e809e3d16a8e60d5ce2fee357cb8e673d93100ea71296184d1d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 5120 bytes
font_01_sfnt_off000102a4.bin
2fbae7cbfd87a388686ca9813212bf31fcb1948041dee7d291781a5671fa7f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 11040 bytes

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