Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef205bc12c1e2ef8…

MALICIOUS

PDF

44.1 KB Created: 2020-11-08 15:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c14db51286b696d476c1df23e8bcadc3 SHA-1: eaaea88f5e7c95b0d0a66a1cd655df1e9a97a57e SHA-256: ef205bc12c1e2ef81efcb4180170d45edfcc158c3220bf86cb3a8cf508773c1e
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://traffset.ru/aws?keyword=amazon+legal+department+kpi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5fa7de2d17474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5f8c4d4610049.pdfIn PDF document text
    • https://lafibovuvi.weebly.com/uploads/1/3/4/6/134653173/wuxuxajejaziteduru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f9255b33e9ac.pdfIn PDF document text
    • https://gitexerepasali.weebly.com/uploads/1/3/4/5/134577484/3516333.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/vokeri/25538156549.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/69606803870.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/tojukoziderorijo.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/lisupedafodok.pdfIn PDF document text
    • https://sulifisaw.files.wordpress.com/2020/11/adobe_acrobat_reader_exe.pdfIn PDF document text
    • https://foxonutovis.files.wordpress.com/2020/11/jumupusudap.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/vaxejukupujiratap.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/2008_panasonic_viera_50_plasma_manual.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.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_off00006db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB6 5204 bytes
SHA-256: f47bd50259dd6a42ee0d4d46aa926e0b76421a30029810b0eeb425f977672431
font_01_sfnt_off00007f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F56 10868 bytes
SHA-256: 2231dbbe9d151bbf5720ac06c0b412458b78dfbfb2cad049ef2839532043e964