Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d04f97775fac20e…

MALICIOUS

PDF

51.5 KB Created: 2020-11-09 13:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-18
MD5: 417a347487308337e251b2cd46f23189 SHA-1: 4540f92c207f62d5ec14b2979e3610d19c1479b8 SHA-256: 5d04f97775fac20e57e139f8b59732a09ae773291b11baf1ecb02a2fd8301025
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://trafffi.ru/123?keyword=search+profiles+by+username PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417423/normal_5fa774a5d66ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f9db00acf159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_5fa8ceae9447d.pdfIn PDF document text
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/suwebiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/624fd98f-235f-47fa-ab07-6f7525b2b9da/gekerepovisevurufebiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/naxinuferufoxotedelumekex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca2dc5b-53a4-4b7d-bc75-376a73b7068a/snapper_lawn_mower_parts_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/17238771001.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/subemepesamufi.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/anatomy_of_digestive_tract.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 5092 bytes
SHA-256: 34cd0012ceb805b5f2e510fa580099a2fd0eba2ace2b3e72706a70aef00133fa
font_01_sfnt_off000074e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E0 5600 bytes
SHA-256: dd1629c884ab71181c484782392e838ab6470708d66e2bb96bf3a876456c7bc0
font_02_sfnt_off000087bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BB 6244 bytes
SHA-256: f713bbc54bb123c6f43f185372f7e426175ed64c68de66ba30c5e3b70b3c6a1d
font_03_sfnt_off000097f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F4 12112 bytes
SHA-256: e88833975b2884d6eef5a9580d6c7e957f5eaa2b9387537376f17c1599d9ee98