Malicious PDF — malware analysis report

Static analysis result for SHA-256 51056296af02a6d2…

MALICIOUS

PDF

57.9 KB Created: 2020-10-02 10:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b2527da6fb55f5a84adf78ce8c774c41 SHA-1: 7e10e06622cf826f5fe1be9aeb29d0ac40137199 SHA-256: 51056296af02a6d2042eaf76d897d62305e2c18174477a9e915ae02c7abf64e9
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/pify?keyword=mobile+phone+clipboard In PDF document text
    • http://ruxutedid.rivermontfarm.com/uploads/1/3/0/7/130775997/a6bd8dbb.pdfIn PDF document text
    • http://files.mrsbrandal.com/uploads/1/3/0/8/130874034/2207066.pdfIn PDF document text
    • http://furuzir.metrochristianlegalaid.com/uploads/1/3/1/8/131856158/zadatur.pdfIn PDF document text
    • http://files.thebeardedcardtrader.com/uploads/1/3/2/7/132741556/7864212.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/4a1a89d7-e360-4427-a52c-1119e9503266/xepedelovomewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507767ee-fda5-4117-9b49-776f379625ca/nedot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec201170-bdd8-4805-8659-2a5c74ff1345/61313962663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf4f6aa-3d59-4e6d-912e-86f165c78265/95862701242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808aad6b-83f0-480d-adbc-f90c7875e19f/22993080457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e543463d-b32d-4a1f-afa3-97e3c63f5fdc/valikuzokizoxopowuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d304ffb-ce6d-452a-8fd6-aa346bf05565/puvenik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae67afb5-e318-42c4-a5d7-e72fe678f571/41237781473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159c58b0-9d3d-4bf0-b096-539a428888a4/47385354495.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_off00009df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF9 5128 bytes
SHA-256: 91e57ceaab15b7dc760da3d356e4a4c1dcd10bc7765f7bc5f0e6d35134c32a7d
font_01_sfnt_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 13728 bytes
SHA-256: 5cc53b696879ac5bcf9781432387c9776742a791f096bea7fb5062d4caa84891

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