Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ca4f26f6fe83bd…

MALICIOUS

PDF

61.9 KB Created: 2021-01-20 17:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: dc600878265bb4b3521aedaa8064ed09 SHA-1: 66e2f003273070c4db6b33a6de968faa1cf31622 SHA-256: 03ca4f26f6fe83bd8ffcf65776ce93a82287fd855d07253dd9a01cf183d488c9
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=knife%20wallpaper%204k In PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5ff8ed5c2cfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fd7faadd2832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416656/normal_5ff4a31fcb20e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_5fa5d4d32c7f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f8a73a542ead.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463009/normal_6003f9a2c655e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fd0925fbb625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fe00518d360b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492245/normal_5feba04c70a46.pdfIn PDF document text
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/4327433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fb5b60fe64ff.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/norozovijalu/subesiwufijibuwana.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/amla_medicinal_plant_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/ccna_data_center_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/35530039895.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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 4932 bytes
SHA-256: e3b18f41f6d03843b85defa5c13a49cd96ee7337e99ba5a79036ba11edcf470a
font_01_sfnt_off0000c6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 10788 bytes
SHA-256: 92a4ca6534eea52bf0667f2b3b9edb4b63e0dd00d2999d5a68f39119f4fff2d5

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