Malicious PDF — malware analysis report

Static analysis result for SHA-256 2365526b8522e15a…

MALICIOUS

PDF

41.7 KB Created: 2020-10-10 11:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 8095af627344d2e6239c3fee62a242c1 SHA-1: f2e551fa0188a45360e37ee43d0b73f0e6493f77 SHA-256: 2365526b8522e15a5b243e226bf103ea4e26c5c110876126ea026622effd94d0
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://gettraff.ru/strik?keyword=rules+manual+science+olympiad+2020+division+b In PDF document text
    • http://files.anabelskyecreations.com/uploads/1/3/1/4/131483371/310247.pdfIn PDF document text
    • http://naxinoke.orffnovascotia.com/uploads/1/3/1/3/131397997/tobabet-zuxoj.pdfIn PDF document text
    • http://files.waiheelimu.org/uploads/1/3/1/6/131607174/nomuvawezilamaranu.pdfIn PDF document text
    • http://files.frenchquartersalon.com/uploads/1/3/1/4/131453595/teradatesi-vagilutuzajikid-fatedufe-nalafegivepipuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cec700-98fc-4b26-92e1-bfeab7e53db9/27182323884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcebf2c-5f31-4968-a60b-98116eb4f72d/38639407530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48be849-06b3-4986-9013-5773712bfdc1/42879459199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3623b7f9-e266-42b3-838a-f1699cbb5ccc/jeperetuzevax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45447945-c267-4416-a59b-69673c8b1a0e/zivenizaxaduji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8759/6182/files/66259366776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6775/2100/files/the_big_three_ww2.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_off000063ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 5708 bytes
SHA-256: 0ff1dbd755bbffdb9bb1fccf9d1aeccba5d6883e5dc0f57760efb45b69aaed0a
font_01_sfnt_off0000770c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 10212 bytes
SHA-256: 5444a7e28e95a713ee66a0030dc13e7f043adf070fe4d7bb7acdbb4d474e61fa