Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7ecb324fba573e…

MALICIOUS

PDF

48.4 KB Created: 2020-11-05 22:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: e215536475591d6134156988d18ab465 SHA-1: d9f3894526d8a129914a71cf75af1b5364ed075f SHA-256: 1e7ecb324fba573ef17d3e8389ce5fba8e03801ef2867478953fd6cf38ca7a46
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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?keyword=star+chindy+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5fa01a7aeb91b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f91582780590.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/mewejitesejafan.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/bf2e4730-4b21-40d0-9769-5434c1e6e980/zujodokiwijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7926d2b-b6da-4d4e-abbe-0687be694a8c/zuvibapiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c45f1b9-b835-4b12-832a-eaaa87e12516/wivutitunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401351b7-bec5-49b8-8b5d-2db16ef3c3d9/26150796114.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/36279607704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f5ac59-9935-4ddf-b06b-af3bd115035b/17158105562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c7357b-90af-4aa3-b17e-2be6e58d0d2d/74189970758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d05e29e-84a7-4962-b0e9-7a30bd73ff25/31973590705.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BB 5220 bytes
SHA-256: 04c83af814734d3b6f1cd3232f0f5e2703af7f841b79992a3a92e4c84c29a550
font_01_sfnt_off00007283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7283 14128 bytes
SHA-256: d7960e86a991a0841ab38122eeb8c81610868a576a799de4121d6ef6813a6932
font_02_sfnt_off00009fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDF 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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