Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8131b5aa4ad7acd…

MALICIOUS

PDF

58.2 KB Created: 2020-11-07 13:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 21decd9da7a2af98d3722041137178b3 SHA-1: d173204a0260059763f4094ec368fb38a45a102a SHA-256: e8131b5aa4ad7acd25bf7535ef0f5c1c61533fad6a117f0a75f6eb5f3195f10c
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://trafficel.ru/aws?keyword=greenville+rental+properties PDF link annotation
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/e2f3b.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/3388739.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/ad84c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/pat_quinn_actress_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/ji_suk_jin.pdfIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/fubipasikefop.pdfIn PDF document text
    • https://s3.amazonaws.com/pofumapetat/kozorojafa.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/worixibegulojebuludevapo.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/best_blockchain_books.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/97624325015.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/76125131604.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b21d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB21D 17908 bytes
SHA-256: 3f3dccfbf16ff96907c0d72696c69a80e85c7f739bda0ff21a6f317805c2d411
font_00_sfnt_off00007eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFF 4692 bytes
SHA-256: 1c2da945845c7bb7833e73fe1a11cb9ed384961cbbe45373d8b893225672a453
font_01_sfnt_off00008ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF7 10200 bytes
SHA-256: 7952f11571596c9ab5066991c93b2494547092c6649de8388968f13689855cb1
font_03_sfnt_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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