Malicious PDF — malware analysis report

Static analysis result for SHA-256 18784c7a11671d41…

MALICIOUS

PDF

71.5 KB Created: 2021-02-06 09:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 31263f72c53fd726e2e9c9643a8f2147 SHA-1: b0bef15a5fe4040b9975f154c7b8f595c13499d6 SHA-256: 18784c7a11671d41c72127e28007f69b61beabe3c19ecec2211cb84a72c3f765
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=worksheetfunction+vba+lookup In PDF document text
    • https://tineminelebon.weebly.com/uploads/1/3/1/6/131606156/ladogatig_dogobo_mozelome_remezesofigo.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/80ce24e43192.pdfIn PDF document text
    • http://effektzhizni.ru/fepalarunxkei.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/ridolinovixurudidego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5fe789dd54007.pdfIn PDF document text
    • https://ponefapu.weebly.com/uploads/1/3/1/6/131637257/02dbe.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/e8c4419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_60038ccf8156d.pdfIn PDF document text
    • https://muvuvudu.weebly.com/uploads/1/3/5/3/135351086/bubisotaxofezatog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413735/normal_5fcb9c82472c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_5fdb073f0f4ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5ff88ec55d581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5ff576257bdfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fcef0215ed6e.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/vukumesoj/7774477743.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_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 5380 bytes
SHA-256: 50e41e95fc6b1612610891bd74f3a6f0f7bdd81873844800a174d1172db3a34a
font_01_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 14548 bytes
SHA-256: 6f3c75400b71c705b4cf2913acd6e784f29b3577a3fb64cca49d7611eb5f81d4

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