Malicious PDF — malware analysis report

Static analysis result for SHA-256 f078024be3d54492…

MALICIOUS

PDF

42.6 KB Created: 2020-11-07 23:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 400df1b630c59ba234fc229f9291a5d4 SHA-1: 654063c1adac36ce86feb1b9e07103cedda7805f SHA-256: f078024be3d544924b41c40a53924fb287c9c5b47c3cab75c7baabc6690ab257
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://trafffi.ru/aws?keyword=centurylink+email+application PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5f9ee57fd0225.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/vimufimimipiba.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/vabemavuputenif/3365474997.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/wurofefub.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/macroeconomics_homework_answers.pdfIn PDF document text
    • https://rexebob.files.wordpress.com/2020/11/losijepabakowopibo.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/fortnite_skins_names_season_8.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/maharashtra_state_board_chemistry_textbook_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff227ec-b11e-43bc-8405-0dcc608a8b08/72985074878.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/1209407186.pdfIn PDF document text
    • https://sopudag.files.wordpress.com/2020/11/99817875930.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/37044919404.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_off000067e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E5 4972 bytes
SHA-256: ce3bf9207d4761a49de3b88c51f98344c0cd83e3250703a995b90bfe77e1f2a0
font_01_sfnt_off000078be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 10804 bytes
SHA-256: 05a18a8fd55f856c9ee9124e14004d3c656df4fcf3b9f4c2c42a6123b36d3e0f