Malicious PDF — malware analysis report

Static analysis result for SHA-256 881e495497a0ace2…

MALICIOUS

PDF

43.6 KB Created: 2020-11-07 23:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d95f7ec1aee152e949372c8a8c654dc1 SHA-1: d729094b319d283b6831171be4dcdb3ef8f4925b SHA-256: 881e495497a0ace238c5ee56527ca98ecff0691bf089630ef68008bc5d40c925
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=winter+s+bone+pdf PDF link annotation
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/3034102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5fa45d33a67c3.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/wuziguxazus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f9005d942213.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/3530069.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/ee1660a3c9b.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/zokokamu/38880537939.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikikev/recep_ivedik_6.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/late_nite_labs_answers_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/jalofivovufola.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/moving_words_math_worksheet_answers_page_28.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/bhagavad_gita_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/tezoki.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/71796192454.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/columbia_county_landfill.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_off00006ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC9 4948 bytes
SHA-256: b178ba1dab0bf19045a73a20c1f3ba47838e8259c7fe9bd73699b355caec0eca
font_01_sfnt_off00007bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB4 11128 bytes
SHA-256: 62cc9254f89c974cd577d8c7f3952cc72860f158582440220fc9e339aae8dda5