Malicious PDF — malware analysis report

Static analysis result for SHA-256 d361b81d3fddfd3f…

MALICIOUS

PDF

43.9 KB Created: 2020-10-13 14:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 45b0ddc7a644379ea24c176fd7a6de3d SHA-1: cc7da313003b48c1d1f43c8d5eadd8a0165fa393 SHA-256: d361b81d3fddfd3fa3c24c3d51e1ba3cd59370116d2137a617a2ecd752961c92
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/strik?keyword=systematic+desensitization+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/297c0.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://site-1038565.mozfiles.com/files/1038565/24835214674.pdfIn PDF document text
    • https://site-1038674.mozfiles.com/files/1038674/81701659296.pdfIn PDF document text
    • https://site-1039674.mozfiles.com/files/1039674/998339312.pdfIn PDF document text
    • https://site-1039789.mozfiles.com/files/1039789/xegiwimibazali.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/kuwekewugi.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/a8401ec7a9859.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004d1d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004d1d.bin)
    • http://www.opentle.orgIn extracted file (font_01_sfnt_off00005f84.bin)
    • https://cdn.shopify.com/s/files/1/0494/1132/6119/files/default_subnet_mask_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8556/2786/files/warriors_the_darkest_hour.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/42466096361.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/6009/3895/files/rotiridegusim.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_off00004d1d.bin)
    • http://www.gnu.org/licenses/gpl.htmlIn extracted file (font_01_sfnt_off00005f84.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1D 5428 bytes
SHA-256: 850ae3f677530ba07f13f622f3c2d0a72718feaef0459755d3166d2af6232363
font_01_sfnt_off00005f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F84 6180 bytes
SHA-256: 52355759f6ba1634ebf803835453c5f0cbcfa1783c35bff7bbad6af133335d0e
font_02_sfnt_off00006f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F80 6068 bytes
SHA-256: d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
font_03_sfnt_off00007f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F30 9552 bytes
SHA-256: cc532ddc4582394325872ea5208d09592f8ef690075f7f77ec7bb84069132614