Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5276dd531733a6a…

MALICIOUS

PDF

75.0 KB Created: 2021-02-27 12:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b68e1ac06262cd000fe72af0b2bda711 SHA-1: 78c8a3e1aabe9c37809805ce86b24c7032682819 SHA-256: f5276dd531733a6a4f635ab5c4b3b17cd231d664822a4e1761e4f6f10e1dcf70
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation scheme.

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://lozipotod.ru/strik?utm_term=what+is+ict+computer+programming PDF link annotation
    • https://cdn.sqhk.co/vumuwuxa/uhhijic/angry_birds_2_crazy_credits.pdfIn PDF document text
    • http://hookup754.fun/where_is_the_nearest_seventh_day_adventist_churchvajs6.pdfIn PDF document text
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/vaxojexufu.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/479187.pdfIn PDF document text
    • http://generatorsale.ru/nursing_interviews_questions_and_answers_for_universitytvcyl.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/iinhdjg/5676760814.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/minag.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/pogudotokek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5ffd095a80cdf.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/iG6a6I2/64253788444.pdfIn PDF document text
    • http://it50save.info/rutuxedodabopobokevapobe7q2bz.pdfIn PDF document text
    • https://cdn.sqhk.co/keperivosa/hdBaggv/7945560014.pdfIn PDF document text
    • https://ragadavifomo.weebly.com/uploads/1/3/5/3/135306528/vevugizagojavitin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 5328 bytes
SHA-256: e0666d7e4585105d9744e83ba9b9523942068aab67fffd048c46646050f8ae23
font_01_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 10496 bytes
SHA-256: 246ad1c48026e96e03b654aa5b50e51e1ddfeaebc03c6ce28b1727da77769ceb

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