Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b04fc3f9d59f2d0…

MALICIOUS

PDF

74.2 KB Created: 2021-02-17 17:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: cd328894588ec6c8c514982b1497e36c SHA-1: 71acf6fc9d2c96c06b42f4b25e465cf8f294099a SHA-256: 4b04fc3f9d59f2d0e9bb16c7320a5e7d4a6ced66407fc3d5f1678f87b071bf28
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/aws?utm_term=what+is+a+good+french+door+refrigerator PDF link annotation
    • https://cdn.sqhk.co/depivuni/dOkvfYS/guvogevonajudimas.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/nudiva_binotova_japomap_lakejakokoporum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5fef9f324b6a7.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/tavaz-salipol-lamawujosug-nujuzogep.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/heLCwgg/dead_zed_3_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/iia9jd7/amazing_world_of_gumball_season_6_episode_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60241cd9ac463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fdde4fd9bc74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470961/normal_600ee7179789d.pdfIn PDF document text
    • https://cdn.sqhk.co/butexuvokufo/oejjjfn/criminal_case_vs_civil_suit.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/iaai3ji/kuwap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470380/normal_6006fa356f5ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427781/normal_5fce102ac96c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_600d59b71e237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe003de57214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 5264 bytes
SHA-256: feccb8a0019f40e2d3a1be9a5b9962feee616e8750b99d37253e5bc35135382e
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10292 bytes
SHA-256: 7d31e86dd1ef649b771802eeef617642d438c426563a78c0f2d52f0260820001

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