Malicious PDF — malware analysis report

Static analysis result for SHA-256 584e55c77109eed5…

MALICIOUS

PDF

47.0 KB Created: 2020-10-25 21:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 630b8d1c8cf870bef57f932ec4fd8b3f SHA-1: 0529a1e900e0b1b057ad13a44f8d61c297d0a004 SHA-256: 584e55c77109eed5b0d3ed16cc6bc42321426c39325d1e23672f9f9998ca87f9
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://cctraff.ru/aws?keyword=iit+kharagpur+b+tech+cse+syllabus+pdf In PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/98e52ddfe33.pdfIn PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/5607706.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/dekefomivupe-kovak-talajonipa-fedebiraroz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5f935f4997e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f93ddc660771.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/joxuwasep-bugopu-sunovalururavux-rifovudovim.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/6532961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_5f955c686a4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5f90694b6078c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5f94bb17b7f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f8e6e6343738.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006a51.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006a51.bin)
    • https://s3.amazonaws.com/tujeviwakirawu/lean_muscle_diet_plan_male.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/tigukifanaverub.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/66839419504.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/74210517581.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/disney_animation_book.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 extracted file (font_00_sfnt_off00006a51.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A51 5660 bytes
SHA-256: 6756c72202bd6718d91b3c2ccdefa00cfecdb0d273f75052aa429c991867613f
font_01_sfnt_off00007d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D83 15832 bytes
SHA-256: f59b4ca8166273be84fb0568900310af9d8f331e2187412522468ce05a6b32ef