Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc39946513b7bdf6…

MALICIOUS

PDF

55.2 KB Created: 2020-11-09 09:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 7c8c4d715dc186506338496bc3852297 SHA-1: 418011a118a2fc0ed7ff363c2cb0b3d1ea2c2a2b SHA-256: fc39946513b7bdf63e8fdfe9507e7e1a293275930f4fb272728a9b9a155808f7
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=directions+to+fremont+canyon+wyoming PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f872247469e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f9271b21db32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fa1662a010bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f87be61d9dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fa4e3e80ccd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f896e60d3d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f87019f5a819.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://ragejaso.files.wordpress.com/2020/11/jejovizuwo.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf062664-0e25-4cc2-9075-30a67ae34e89/51500714420.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/teriyan_deedan_song_download_mp3.pdfIn PDF document text
    • https://komipisi.files.wordpress.com/2020/11/horseshoe_pit_size_dimensions.pdfIn PDF document text
    • https://falofuga.files.wordpress.com/2020/11/forensic_files_palm_saturday_worksheet_answer_key.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_off000072f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72F7 5360 bytes
SHA-256: 6236c157e2265be4014561875fa9be1ceb722249b6275e60671a1d4ab81b772a
font_01_sfnt_off0000853f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x853F 10968 bytes
SHA-256: ac8f56f84f828eba0a3715d0beace42ac64859ac1da6acc59ba27d67b17cc664
font_02_sfnt_off0000aab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB9 12208 bytes
SHA-256: 0317e6f37b067da77c154d1cb6407b3c560ceb0811b3794b467ddce605e28611