Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff67f65718820b0…

MALICIOUS

PDF

56.5 KB Created: 2020-11-06 12:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 765dde799a4a0a5c06da661429ce1356 SHA-1: 4a9c6756e3f02374574657988e9f3db703da2711 SHA-256: eff67f65718820b0f1920116c22dc4cbd9d38bc7830ffcef6076c71b8ccfc8a3
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=slope+google+sites+unblocked+games PDF link annotation
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/ruxugod_jimufitepop_xubugagewiwexen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5f9bbc7e1fe50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_5fa20dae3a0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5f8d39a8e7162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_5fa4c8774dbfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f9d1a1a4c30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f9e1542ed245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5f9183cb5b851.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/zasepo/nowavix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b0e9e9-ff1a-4388-9152-48a8b2a33112/fagapumivekukizis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea34030c-74f2-4df8-b9c5-c6143725d529/lone_butte_casino_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc415c74-c6bb-4af9-96b5-6f08ddffcba9/omnibus_f3_pro_v2_flight_controller_manual.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_off000090f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F3 5484 bytes
SHA-256: 1902a63145ed394b7b453f2399002425983c90db02ec9aedac4ce6c7033b248d
font_01_sfnt_off0000a380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA380 10504 bytes
SHA-256: 9699b13158c7d3a1d904e3e1d2d4683a867a4c37c9c172e3a4b1311cbff2f150
font_02_sfnt_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378