Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e7804b73f2d243…

MALICIOUS

PDF

72.8 KB Created: 2021-02-17 07:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7d8c5679e4041fea6a8acbe734c62f57 SHA-1: 2243d0ba9c98704f7b273fc7497c2921e6cfac94 SHA-256: 19e7804b73f2d2437cf5abde5c36b9adfbd6a7f95b6ebd985384ad7fb048e25c
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://yafferge.ru/wix?keyword=act+2020+changes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_6024b8314483c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382631/normal_5ff4e30fb3094.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jWxggwH/how_to_solve_brain_test_level_38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_600ebf6db5a4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5ff34021da3f2.pdfIn PDF document text
    • http://mamivadusijuf.iblogger.org/baba_sehgal_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fe295c2cffba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5ff283b688402.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/ghhjjha/26578444933.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/jizusanuwavexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wopolew.rf.gd/xexobilagipugisifubigu.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/kepize.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/website_design_vector_free.pdfIn PDF document text
    • http://xifudovolamam.epizy.com/bozupefazexebafogupoja.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/quotation_follow_up_email_template_to_client.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/energia_eolica_funcionamiento.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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 5196 bytes
SHA-256: fe524e57509747340bdb4119c617208322bbd97b523b68909d92c316cf4aaf13
font_01_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 10620 bytes
SHA-256: 02ffd53fc4f78ee4d12d71e876bdaa19c3c314c69e75e3110551edce262e362c

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