Malicious PDF — malware analysis report

Static analysis result for SHA-256 e247f4a633ac6fb9…

MALICIOUS

PDF

39.7 KB Created: 2020-11-09 04:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 23621cfc0f9602fce484ec34bb6bf940 SHA-1: 595fd719cdcc577722043a0976ac9b5aa3ca0908 SHA-256: e247f4a633ac6fb9d0fcf48f3b41c178bc8ce14f6676b3e286a7454be8babff7
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=cross+sections+of+geometric+solids+worksheets PDF link annotation
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/9862040.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/fulomufimikim/framaroot_latest_apk_file.pdfIn PDF document text
    • https://fazojikimugu656942302.files.wordpress.com/2020/11/pugatenenaxajal.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/jetapanel.pdfIn PDF document text
    • https://fufezirures.files.wordpress.com/2020/11/levoxixisivulide.pdfIn PDF document text
    • https://s3.amazonaws.com/jolufozo/ge_spacemaker_xl1800_charcoal_filter.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/derivation_formula_in_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/bhagwat_geeta_saar_in_marathi.pdfIn PDF document text
    • https://bitoriwemik.files.wordpress.com/2020/11/sexis.pdfIn PDF document text
    • https://zojuxidila.files.wordpress.com/2020/11/14625050125.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/arts__letters_daily_website.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_off00005cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD7 5288 bytes
SHA-256: 56bfbc08ad463f7b93c303945d575beab1194979864b7e9518d653e339c4867e
font_01_sfnt_off00006ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBB 10280 bytes
SHA-256: 9b38eabd57813658e34d91aa241f862a5b57eae067f9da6868310c9043cfbcf6

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