Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f5ca5e82763fab…

MALICIOUS

PDF

38.3 KB Created: 2020-11-06 17:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: bb857a9fdd3ae8442fb3dac0ca19a7eb SHA-1: 2666501b8c8345f91a03cf212e79519bed362fc7 SHA-256: b4f5ca5e82763fab332b1a4559166bc79d4a7a87718ab56bb301f5de97d5cc6b
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=osrs+digsite+pendant+unlock PDF link annotation
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/gafadox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_5f976ff3b4bc3.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/kakef/cadre_allocation_policy_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/rugoguwesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa14f670-f86b-4c03-84b2-9e68e837f2c3/52791803870.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/20455198305.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/addiction_disease_model.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/action_research_project_for_b._ed_students_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/rumutupogawe.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/34437124964.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_off000057e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57E0 5332 bytes
SHA-256: 9ea106604e11c22cc04b2db7e0b52ad7db0f85be83d93fbb451c70a969f4a4f9
font_01_sfnt_off00006a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0C 10376 bytes
SHA-256: 78cbcc4b7cad50459e39415544e95e58d261fae435ce8fdb368a81cba38f6afb

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