Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c821115a1c7dd8…

MALICIOUS

PDF

36.6 KB Created: 2020-10-16 09:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 5f85c9556773e7589fe40cc8a4bc2fbb SHA-1: 18e3c672a98e2e706fb1b43d79b808a361a2edcb SHA-256: b2c821115a1c7dd846cd6050000f7b1622b7fc0e1bfac92cfaa4b028bbacfc31
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=superminds+year+1+worksheets In PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/pofexotokonadu.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/tipovu-bomoba-rewifu.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/775cd489.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/nedav-fukew-jerifolad.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/5677701.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9297/5011/files/fema_is_22_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4093/8410/files/poison_spyder_hood_louver_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8771/9317/files/xenukamesezafuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9570/3711/files/jagijimiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9675/0746/files/gulerefiwipelilefazupad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/6851/5012/files/android_imageview_touch_event.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/danby_mini_fridge_dcr34w_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dad4865-5066-4c5a-b2c1-4b1cd869f173/bevupogujedijipokunujaxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9b9324-aca6-425a-9665-16330b52cc3e/jilekaporonirizaranidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3fef74-1869-42b9-b4f8-93910a4132f0/249970798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1249fa5-8b41-414a-b814-77eeae149765/bawijumukolikil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a464a2-68cf-4887-bc00-d9a41df6de9c/76946651413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21c2387-d22e-4b3b-974c-51a33b9fcb6a/80969401341.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_off00005119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5119 5580 bytes
SHA-256: 01f878751e44af4f219b0d0ec2c4814f6bb1292576c57ea63d5dbd0f4dd67bb2
font_01_sfnt_off00006402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6402 9868 bytes
SHA-256: 03aad2dbbc40a4dcd447f2564745b41c3e5e54c92a6dd5f7d929de9f6c64b5b6

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