Malicious PDF — malware analysis report

Static analysis result for SHA-256 188b471971942893…

MALICIOUS

PDF

86.1 KB Created: 2021-02-02 22:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 8a353b778b2cf14167f36e6c7b224e64 SHA-1: 90431b83b4139595c83a44859ffc0a8c517827e4 SHA-256: 188b471971942893a03c740e1640cbd1dea86a7eeb31f513f7099ead5838ec45
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wb?keyword=math%20problems%20for%202nd%20grade%20pdf In PDF document text
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/891c9218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fd3555fd7b4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fdde156a4d51.pdfIn PDF document text
    • http://axecheat2.xyz/minecraft_pocket_edition_free_pcnf3kw.pdfIn PDF document text
    • http://pitushok.fun/candy_crush_soda_saga_download_for_maccjnq5.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/4f6f4b6778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5fd8b22a0ed59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495409/normal_5fcdf94388ece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_6005087355743.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/teximikamukubo/define_arioso_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/nezurabaxazu.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/734389242.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/du_b_tech_form.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/dumasagobagefad.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/6967252033.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_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 5732 bytes
SHA-256: 31ee6e865625dd6494d55f84e3ea129be2c2051ad0f0d599338c0bf8aa63d233
font_01_sfnt_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 11072 bytes
SHA-256: 559fcc8c0094c2c07fdd23b492e001c3190d4e2a07517776f8214dc138226cd4

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