Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf92cc2632f7c771…

MALICIOUS

PDF

60.0 KB Created: 2020-11-22 10:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 9468f4814bf6f59ddfebdf9453c4d5df SHA-1: 779867de7c7fd0d8c2926f9d25778db9bf599374 SHA-256: cf92cc2632f7c771f5608152628344d7e7294e6c55db0e168a8b796b5e831b05
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/123?utm_term=articulo+16+de+la+constitucion+mexicana+explicado In PDF document text
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/6867768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_5fb5a72e5bc8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5fac079c57022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_5f9b66f726f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5fa00e85d1122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa66ca4-e76a-4a63-a1ad-2ba7eb6325d0/jamerawajurobomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d0ac49-fa16-4958-943a-203de4ec5167/jifadigopegumemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfdfbd8-18c9-42f6-9007-779d0f7eb90d/36990415470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e540207-6471-44a7-8e5c-244631d71e99/best_crossover_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0905209f-3c04-4eaf-b396-7758b96da65a/new_dirt_bikes_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d703fe22-3474-4084-9c5c-f9eed3021446/9049297373.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_off0000af51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF51 5480 bytes
SHA-256: 8b0bbd528f9ad9e4b2d1c1415c2f95b11ecca0f41e13b8d336cadf2749c40d16
font_01_sfnt_off0000c1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 9592 bytes
SHA-256: bb9da0da2c9d9b13017972f60645f4dc8323cc4f7614e4bcd3df20cb0c57fef2

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