Malicious PDF — malware analysis report

Static analysis result for SHA-256 16776c5ef1c9b259…

MALICIOUS

PDF

35.5 KB Created: 2020-11-09 16:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: b899788f6d78e37086d0ec910abd35b8 SHA-1: 700f1c32a3385fbbb65f40745b69dd56a5cd1710 SHA-256: 16776c5ef1c9b259caf1da5bbb885907aff62fcfb26ca918d4a28536c38ac175
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=letter+ii+worksheet+for+preschool PDF link annotation
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/d78ef49aa.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/fizogop.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/48cc03386.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/6416259.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/julaxel/47671058055.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/edythe_j_hayes_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/53890105999.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/upsc_interview_form.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/business_partnership_agreement_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/femonapujoz.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/xifipigekoxutovowusonazob.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_off00004cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CBE 4988 bytes
SHA-256: d32963a7c60ad2c5434467061ec0a5b0fb1e5532c7bbee24f6b500c6e9439eb8
font_01_sfnt_off00005dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD3 10432 bytes
SHA-256: 6f33185950e5202179a777b995c02c2838eb5776a57c1a478764c2f7811812fb

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