Malicious PDF — malware analysis report

Static analysis result for SHA-256 f336c8a73aab6b4a…

MALICIOUS

PDF

70.2 KB Created: 2021-02-17 09:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 385d8882bef2a50532265fd4ce5f990a SHA-1: a320e86d842a734448a3bdb2d4e7ca322f8c5116 SHA-256: f336c8a73aab6b4abec4a78866b647af506658a725906ff83456ada891d26477
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://yafferge.ru/wix?keyword=cummins+kta50+service+manual+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449605/normal_5fffb62929f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496584/normal_6010c48e99bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5fe7784f33608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_602a2d0606a9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_601745591a260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujelolix.epizy.com/once_falling_slowly_sheet_music.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/69552064034.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/jawutawowirixadenelizu.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/xaxenizijukiduxuxil.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/carers_allowance_uk_form.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_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 5596 bytes
SHA-256: 84c0740b763b50869871b67136b0095cfe347c5da766a6cd9cfafbf588680d5d
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 14412 bytes
SHA-256: 7ddf20b1bd110eb7d4c2d690d58fbd4356f217e94894eeee8148ab529fe19670