Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c51be31ec4567d5…

MALICIOUS

PDF

40.1 KB Created: 2020-11-07 00:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: f9b6c87a9bd7a638687a433c0175d6ce SHA-1: e3b422411332ef14f34e89bf58b81f2b61cf79d1 SHA-256: 3c51be31ec4567d54ba96379a90288bb94797bb17629547c5040539383332845
76 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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?keyword=letter+of+accommodation+for+school+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5f9216bbbe078.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/321ba7229b0f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f999105e6b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5f9e93e7ef21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f8d17061ed3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5f9ba9d728b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f94992696333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_5f91434b90193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecde80f1-6ab1-4de5-9616-2cf1429177ea/saunders_nclex_rn_6th_edition.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895cc623-5177-43a3-a404-c79018ca8ff0/danagozew.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/aptitude_tests_with_answers.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.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_off00005c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6D 5404 bytes
SHA-256: 76a44fdb52a8ea323b4bed8b16148153e9ec71d9ab41e154d4de3a10d1039faa
font_01_sfnt_off00006eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 10412 bytes
SHA-256: 230cbbc6a424bb75ffde481e6e76350341bc94003b633474b52fbfed9c12ef88