Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fac9fcd9f68def…

MALICIOUS

PDF

42.8 KB Created: 2020-11-09 10:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: adca7cdbdf4617221a4ce6aa417220c5 SHA-1: e3f0ccb9f50f70579787a1b40141cbc3d43fbb0e SHA-256: d8fac9fcd9f68def1aa80a647e4be49bee64653e81f2605a6dc5bb41c2253059
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/gipufosepirisakir.pdf.
  • 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/wb?keyword=hulu%20+%20live%20tv In PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/gipufosepirisakir.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/nawavemibol.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/70d98076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f9f87628fb3d.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/vetamedisoz/cute_female_yorkie_puppy_names.pdfIn PDF document text
    • https://jarakapirapi.files.wordpress.com/2020/11/6250167882.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/law_of_multiple_proportions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/pk5501_programming_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/how_to_pronounce_the_word.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/89246960891.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/que_es_anuria.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_off00005e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0D 3880 bytes
SHA-256: 5156d22ae65f4e7c13cbd4d7bef6338007120b23818044e82c4bf531ec4b1632
font_01_sfnt_off00006b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 11092 bytes
SHA-256: bfd09278983f77ad03e8ccd5b4d2a6a570b9a11201932a76bff23be46314f0e0
font_02_sfnt_off000090c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333