Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b5f5437b7cab50…

MALICIOUS

PDF

65.5 KB Created: 2020-11-13 03:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 5b466202f76404fe4e3803758eb36247 SHA-1: 2582e5483397861334200e29a1ead414d40b9fc8 SHA-256: b8b5f5437b7cab503edf804c617a2947c4c9ee36b489fc2857d14f6279d1c003
196 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
  • 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.
  • 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://traffset.ru/123?utm_term=carlsbad+by+the+sea+hotel+yelp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f8760ddcdff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_5fa7e46c5e9d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fa4881eb1ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5fa85582e674d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5f958825afc2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5f93eb197adf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f97c2554ff07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419832/normal_5fa2d36b0b707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5fa17bff446d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f87c4803f56d.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/bd2cabbe19.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/mutirexa/39501185350.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/ganabufajis.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_off0000c2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F4 5196 bytes
SHA-256: 00a3940df64dd6473b4d99c26be9b0dc2752f53539bcd1f1949510f09415d5c1
font_01_sfnt_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 10856 bytes
SHA-256: eeed08e9b1ed3587e0556c8f3b0fb6ced0775f9c303074ba96d943414a4c9fa5