Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf80c683070e19a…

MALICIOUS

PDF

52.7 KB Created: 2020-11-07 23:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ac6a96e372bdd465a490ac3eb669420f SHA-1: a97cdc1f803cabad61ec918f91e33f86c2c0a26a SHA-256: faf80c683070e19ae872c883b5b06ed6b602c218f83057d419ed7113ac5f46db
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/foguvujineperake.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.
  • 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://trafftec.ru/aws?keyword=mailbox+repair+service PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8f9c0180c84.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/foguvujineperake.pdfIn PDF document text
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/ledolubuvuzusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/27499119135.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/piwumiladimotazepixoli.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/23598961860.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/rugoguwesa.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/kofus.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/86567967600.pdfIn PDF document text
    • https://s3.amazonaws.com/vofosuvuwapiwo/vuluzavidat.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/football_manager_2013_apk_download.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_off00008e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9B 5200 bytes
SHA-256: 35963b2b0a89454e8dcf582588f8249eb906fee6feb00b43a5ae98b334895932
font_01_sfnt_off0000a068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA068 11108 bytes
SHA-256: 9b544dc72928880d516492c43a88f9e0f765753295e9e73116b13ae4092e324d