Malicious PDF — malware analysis report

Static analysis result for SHA-256 1957fd4532003641…

MALICIOUS

PDF

44.5 KB Created: 2020-11-08 20:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 43c74a1edd8eb7025ca8ff6fadb68677 SHA-1: 6a4ee5b920c94e12c3cc130b5929e636a0f6006f SHA-256: 1957fd45320036411d233309eab058d7e6d0858f87b4308c6aa5a3e60ff88d22
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://traffnew.ru/123?keyword=findlay+police+department+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f94271bc7b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_5fa2df1927a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f880af62c15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_5f915c9d1d569.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://lufefot.files.wordpress.com/2020/11/causative_verbs_in_urdu.pdfIn PDF document text
    • https://bejafasuba.files.wordpress.com/2020/11/44120928770.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/20149528181.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/tv_guide_cablevision.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/sagob.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/panchatantra_tales_download.pdfIn PDF document text
    • https://mujejikep.files.wordpress.com/2020/11/lagabevu.pdfIn PDF document text
    • https://pazesuv.files.wordpress.com/2020/11/54784547422.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/transmission_line_theory.pdfIn PDF document text
    • https://foxidusiv.files.wordpress.com/2020/11/gulapif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6371 5120 bytes
SHA-256: 26a4899b791a8d1607164c6620cf694861e9cf733d993ba282eb15ed53f983d9
font_01_sfnt_off000074b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B6 9964 bytes
SHA-256: 6af0453b52fa0f67e184e8acf8cd1c27e9cb9e515d485b405e5bd1af0a06b6bb
font_02_sfnt_off000096c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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