Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f4d3d8bc7c0622…

MALICIOUS

PDF

44.0 KB Created: 2020-10-04 15:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 612ad45e2dc2305f7d6e8a4ecca2c03f SHA-1: fa2b186a87de77f6a3fcd4f8c6cf58cb40650baf SHA-256: 65f4d3d8bc7c062279bb1bcacbf8fe9a606e4bc4fe34f8f688e8a6941b8e46a3
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://ggtraff.ru/strik?keyword=process+writing+task+1+ielts In PDF document text
    • http://mepep.woodcraftguildtasmaniainc.com/uploads/1/3/1/3/131379699/718780.pdfIn PDF document text
    • http://dadekun.cratefoodtruck.com/uploads/1/3/1/6/131606165/c2d5a8.pdfIn PDF document text
    • http://files.dehoniansocialjustice.org/uploads/1/3/1/1/131164020/tejaj.pdfIn PDF document text
    • http://rukadup.mdiaccess.com/uploads/1/3/2/8/132815105/rowokekomulox-waxenawof.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/f8c3b557-534f-49f2-b023-73d46cc2cf08/67179091438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f22d2ac-90f5-4dd6-9cf1-bf77992e9f34/83475618831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c560d3-6b31-4da5-8d5d-d8ef0dc49c23/79607273016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19c1271-0610-49b5-b352-540ea15ce7e3/28883184025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07366dca-efb8-4156-8622-e998f14d885f/42423335681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e07b601-e283-4f52-bc58-cf737d9444d2/43174017170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba9758b-9bff-4c55-832e-524728a41600/kazoropemavuwixixozodele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964bff49-1a7f-4238-9450-e9557c75bc9c/57887922131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ece85c8-0d32-4fa8-b7c7-35cb0618e193/boxalodixiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d7ac27-c20d-4efa-ad6a-fc8e56ec4817/31486399402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0db2e4-53b1-459c-b624-a05ec7390387/fawatekelov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a98bc35-cf3a-4447-8fb2-0f8ce8919779/wevomoxadaxepu.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_off00006dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEC 5176 bytes
SHA-256: 0949cf78763eeb1515201a42bf5b3bc44a669819c271cc64e6b8ee529b856fd1
font_01_sfnt_off00007fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB4 10548 bytes
SHA-256: 842edfae4fbf715b374594fbb0a61abb49ef9d32959e9cb12a901843ee13b271

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