Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ecd672ec90e9cc…

MALICIOUS

PDF

46.2 KB Created: 2020-10-15 10:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 21f5c5e858df1844a116b031d57eb9cf SHA-1: fecb7231e9367d8f509eacb83056f2a8183acc63 SHA-256: 37ecd672ec90e9ccc2c918e620796ed603738b645b06eaffe99c9405a798c346
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://cctraff.ru/strik?keyword=makerbot+replicator+desktop+3d+printer+manual In PDF document text
    • https://site-1040082.mozfiles.com/files/1040082/fupimolovukomuk.pdfIn PDF document text
    • https://site-1039549.mozfiles.com/files/1039549/rigisi.pdfIn PDF document text
    • https://site-1040514.mozfiles.com/files/1040514/veforapitaliv.pdfIn PDF document text
    • https://site-1044498.mozfiles.com/files/1044498/bladed_article_sentencing_guidelines_june_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f87c2287ea35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f873c470afad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f879cb5d5c72.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/63612095354.pdfIn PDF document text
    • https://site-1039784.mozfiles.com/files/1039784/53605091121.pdfIn PDF document text
    • https://site-1039814.mozfiles.com/files/1039814/xawuworabozajonumutafu.pdfIn PDF document text
    • https://site-1043876.mozfiles.com/files/1043876/nakob.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dupuvikadijuraxere.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/6023986.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/ed77146280debe4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9346/8338/files/55395676544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1273/4107/files/elsevier_veterinary_assisting_workbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6968/5414/files/82733324170.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4145/6796/files/stardew_valley_romance_robin.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_off00007429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7429 5592 bytes
SHA-256: e6c3098d462398acd35f24b658727e3391b7b5775e5ef20ceefa074d5094688a
font_01_sfnt_off00008710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8710 10680 bytes
SHA-256: 96d806cafd916b6d04f4df2462a3332c672a8cf23e84222309d95f439bb3da8c