Malicious PDF — malware analysis report

Static analysis result for SHA-256 51abe19d323f6683…

MALICIOUS

PDF

64.1 KB Created: 2020-11-05 20:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: be0c67467dc9350dc438689c27ca2bf7 SHA-1: 9619486dc62441cd192f571d7fc927cc8a8ba4f2 SHA-256: 51abe19d323f6683f2cfc458b56a083fdf45a84bea5327b02cceef58b35dddab
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/aws?keyword=the+way+i+am+eminem+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f90b964e3fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f8dd78742476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5f9e4da1ea3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5f989ac00e223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f90000a71a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_5f9f719c859c1.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/4609989.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/4161298.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/dumixotax_lokukemagizesi.pdfIn PDF document text
    • https://fazatirogefo.weebly.com/uploads/1/3/4/4/134462354/dafedori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5f983373ad5d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/basic_english_words_with_meaning_in_hindi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000c9ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC9CA 24232 bytes
SHA-256: 617acccf36de062c47c4d24abc2ea44f3cb7c0f4677319d9b39ee1e958b1849a
font_00_sfnt_off000091b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B2 5120 bytes
SHA-256: eb3840084eefcea82423df9dba0386adadd922771e071d55a887917b3b22c29e
font_01_sfnt_off0000a314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA314 11276 bytes
SHA-256: 20d5e1c004e62c12401515c7161988640bddd3d74324fc6a27bab69d4c4fefaf