Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d74e3b212867c3…

MALICIOUS

PDF

74.9 KB Created: 2020-11-20 08:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0937d27de7d22fee6d9fb5a958a413fd SHA-1: 7111c26a8438f974cc71776988c226d6a5caa125 SHA-256: b2d74e3b212867c3a4b40695223088d419d54d4d0990b195db52f584550ad18f
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://cctraff.ru/123?utm_term=san+carlos+beach+weather In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fb73bb0ce5c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5fa3b3acb19e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f946f2bbd89b.pdfIn PDF document text
    • https://kageketiwef.weebly.com/uploads/1/3/4/5/134581137/3048039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5f89a478eed4a.pdfIn PDF document text
    • https://fexogobavube.weebly.com/uploads/1/3/4/6/134639764/gufuvujemi.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/zebugafubesilig_sakudake_rukot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/gigabyte_z390_ud_overclocking_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcfc770-d629-41eb-bc9b-2cee71b09805/92012220236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e4a4c2-ce7c-46a9-b421-b44c61eb7543/tukaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da752fb-69fb-4a05-bd40-a50ee03087d3/logic_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9384f427-4f81-439c-9cae-0eb89c3d2571/25202034290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda4573f-ba34-4a2c-ac27-f12898d18689/43819087845.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 4960 bytes
SHA-256: 350f1b21d4e420eba6c59cd3b179a4d3b6816010453f4d94436c30775f58f81b
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 10100 bytes
SHA-256: 56e6fb170a6a7ca141a4c8f4a8b712c2e128be0c40b5fd3bc6979161a819ba0f
font_02_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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