Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a2b6708c150384…

MALICIOUS

PDF

40.7 KB Created: 2020-11-07 06:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 8782770eb1fd3c4e0b6f0fbf4420693f SHA-1: 7f2c9ccd7467018dfd47a1a3b924c3c039b1c5f2 SHA-256: a1a2b6708c15038478acf8260e57010249479e38605ca39139ed1552dee8c6ae
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=peoria+county+recorder+of+deeds+peoria+il PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f8a17622113f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f8dc3b996c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f890fe8be0b7.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/nilugotigemumu.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/gujuvetuziripawij.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/xarojapi/calendario_escolar_2019_mineduc.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/henri_matisse_goldfish_bowl_history.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/abdul_karim_jaffer.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/gosugakivazuzonunig.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/98105017214.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/gabajutujufediw.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/loganifod.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_off00005db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 5252 bytes
SHA-256: 92c5efc92ef41f3499fa27137ceff49f3d0e6b83749d9102ca128b62b4078c50
font_01_sfnt_off00006faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAF 11140 bytes
SHA-256: 868dde020770072233bce4d80a5ba6550485f306ada5d461198f55f569e8e3f1