Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ce439f5598de54…

MALICIOUS

PDF

41.8 KB Created: 2020-11-09 10:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 4ed696fe3e983e5fea95c88233dc9d60 SHA-1: bf8699692dc71c4f5c0dc596cc662a9a92115dbb SHA-256: b9ce439f5598de54c8b2d074481bbc2f48edddfdedce0bfb2f8bb7b9a2d636c7
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/123?keyword=john+kiffmeyer+age PDF link annotation
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/keporobore.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/vovariwogebaxegi.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/besafefaf/cerebral_salt_wasting_syndrome_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/funcion_de_los_acidos_nucleicos_en_el_cuerpo.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/wheelock_s_latin_7th_edition_free.pdfIn PDF document text
    • https://zopifigife.files.wordpress.com/2020/11/xexixuzose.pdfIn PDF document text
    • https://wakijixebe.files.wordpress.com/2020/11/aha_bls_test_version_a_2020.pdfIn PDF document text
    • https://toxuzan.files.wordpress.com/2020/11/nuvejofisamuwosifiripula.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/74163712719.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/principles_of_microeconomics_mankiw_8th.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/xuvemetubijigopom.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/30694987194.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/nasiruvujis.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/nanigepudogaxomij.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_off0000643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 5128 bytes
SHA-256: bf87d959d5d37a96aae120c85f708c618964b83643c3a60d3c776b371db082f2
font_01_sfnt_off00007591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7591 11124 bytes
SHA-256: 9a694dec03ca975f36adc1b24fca27502c841a5d23c2db561a1c4dac59e23fea