Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c28203b5fdc6fb2…

MALICIOUS

PDF

62.5 KB Created: 2021-02-23 01:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6b45ffaec6e1459f1d37cd126ce22046 SHA-1: 1fa13c07e1c0e3000a8127e7c7bceb5a2fb9736c SHA-256: 1c28203b5fdc6fb2ed65ef124254b9d9b17141c9aa33eef3f6cd041f9fe4e61b
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=starcraft+field+manual+pdf+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4487632/normal_5fe1022547094.pdfIn PDF document text
    • https://lifinupal.weebly.com/uploads/1/3/5/3/135336288/jamepasolusaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418781/normal_5ff3f81b55c0f.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/5231317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5fd3bb6a39053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467325/normal_5fe5544587a3f.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/a66c1f.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/b41e379b173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_6006d55b05df3.pdfIn PDF document text
    • https://jotigigej.weebly.com/uploads/1/3/0/7/130739509/sinulodobatawerobawi.pdfIn PDF document text
    • https://wolixakeju.weebly.com/uploads/1/3/6/0/136002716/luwuluz_jofotitafogufa.pdfIn PDF document text
    • http://figironeme.22web.org/27445060645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490263/normal_5fe54060e831a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vokeri/65183519414.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/14974934840.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_off0000b9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A0 5316 bytes
SHA-256: 9f335784a4836375c2ed57b28332dfa32e858b4a2e9ef638ff3fac2175857181
font_01_sfnt_off0000cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB3 9724 bytes
SHA-256: 4cf74be95b8bc04fbc2b26a4d7ed602a41242d96520846fc8a0bbb80fd87d2ed

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