Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c8fa629615462a…

MALICIOUS

PDF

39.7 KB Created: 2020-11-08 14:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a7d252a8b3e019e7b2d0e08bf4188e72 SHA-1: 7ee089718b4fc0e2e08a8613d3cbc797061227e2 SHA-256: 57c8fa629615462a71c05f1a81ceaa19ede2db1d54e9d22fb22c2c97a48203c6
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/wb?keyword=nc%20dpi%20standards%20for%20school-aged%20children In PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/4719626.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/393e87e78b619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bimozevuve.files.wordpress.com/2020/11/17054341220.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/halloween_activity_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/lefisudozikin.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/gymnosperms_and_angiosperms_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/vanina_guerrero_and_dla.pdfIn PDF document text
    • https://dotipamedu.files.wordpress.com/2020/11/zuxufipepi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/worksheet_on_genetics_and_heredity.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/mififodibajatowexekove.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/free_roblox_accounts_2020_robux.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/wirijetujuzarofovan.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/puffgames_sonic_the_hedgehog.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/juxutijanokoxirapofutap.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/movoxefapufop.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.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_off00005cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFA 5416 bytes
SHA-256: 32f72a0748b12454891412841c337725c149872d8ad245ac721e3ac288830037
font_01_sfnt_off00006f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6F 10112 bytes
SHA-256: e95f45138a7ac591f278aecb095a174517186a11d0c19e9343ec80b98275fd65

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