Malicious PDF — malware analysis report

Static analysis result for SHA-256 5138ff97e134f96e…

MALICIOUS

PDF

57.2 KB Created: 2020-10-03 18:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: de7099ff4c6f2f4697a078ae5642b2dc SHA-1: 328c37cb2230fd145aba5376f4506f46cf024175 SHA-256: 5138ff97e134f96ec1cab6c7faa51970a41ab3b51226baa94829e50322dc84c2
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://ggtraff.ru/strik?keyword=%25C3%25A9valuation+pr%25C3%25A9sent+de+l+indicatif+cm In PDF document text
    • http://rudenofed.harlanhawkband.org/uploads/1/3/1/4/131483083/4312361.pdfIn PDF document text
    • http://files.edwardandersson.com/uploads/1/3/1/4/131410872/demizamej.pdfIn PDF document text
    • http://files.woodspring-golf.com/uploads/1/3/1/4/131407135/5696166.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/1/0485/5287/0053/files/hibiscus_clip_art_black_and_white.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9437/9163/files/happy_gilmore_happy_place_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1349/0846/files/ranifetidivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0056/9253/files/60567361110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/mignolo_the_darker_side_of_the_renaissance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748f491e-bb7d-4d75-8bed-daa8131eec66/jotuvizefun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18ba0b8-f57e-425d-ba36-82894b2ccc0f/kisenokunufebuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c48507-1db8-423d-afa9-da5b3461c080/xizanefefizax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e011001-c5bc-46e3-b65d-8f29ecc32dd2/nifatikelukufubibubevenup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26347a9c-2317-4a83-abbf-48ecfa399b95/gafesadone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b488874-cfe0-4f17-b9b9-daea5293a3ba/74065571032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d668191-41b8-4745-a27a-65a6387f4e24/lujer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/943eb069-fa78-4e06-838a-08b669a532d9/sudefus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2b312f-9800-46e8-843a-81d721f7879d/62874361483.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8681 5480 bytes
SHA-256: 19ce6b48feb256b5cc67b6a3caf316402a1b8cf44dcf88219dfaf87d0667f4c6
font_01_sfnt_off000098da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98DA 12292 bytes
SHA-256: 34239c2d72e4efb6b8d4380d0fc3f6f58d6c72bf9965d506b3c9cfea463f5812
font_02_sfnt_off0000c025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC025 16144 bytes
SHA-256: 025386d509c78b8207541941284e2f1348304280be908981bce1691ff030303a

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