Malicious PDF — malware analysis report

Static analysis result for SHA-256 9409b896cfe73c20…

MALICIOUS

PDF

41.6 KB Created: 2020-10-06 16:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 5a16277381b942f8773535bdc99040ef SHA-1: 53ea7934bdeb22cc2490180f41fc1bd7669e81b4 SHA-256: 9409b896cfe73c20d93ae6342c09263dd14e3da805b3ca6337acb4be9357ddd2
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=cell+structure+prokaryotes+and+eukaryotes+worksheet In PDF document text
    • https://site-1039893.mozfiles.com/files/1039893/51692951883.pdfIn PDF document text
    • https://site-1036781.mozfiles.com/files/1036781/wafovulaxu.pdfIn PDF document text
    • http://nipege.swimbhsc.com/uploads/1/3/1/3/131383314/teraragutusitud-melutul-robudivuf.pdfIn PDF document text
    • http://femoku.inspiredfoodforlife.com.au/uploads/1/3/1/4/131482995/rudojub.pdfIn PDF document text
    • http://getibukiz.alanurbanhomes.com/uploads/1/3/1/4/131406226/vibuse.pdfIn PDF document text
    • http://files.bhaconstruction.com/uploads/1/3/2/6/132680974/6003081.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/466ad5b7-42bf-47c9-9070-1ed8d45f30cd/kagorubanuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822f33dd-ff6e-41f4-8872-eb853a49388f/ponarepufebunozepenuluka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9f585e-cd0f-4503-a427-15b542c3adb4/79731828536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a4b22e-0590-4eb7-8668-f5fc94a59ce7/27363518598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e95ee42-0490-4c6d-820a-42f94caba0d6/kepelibateb.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_off00006634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6634 5324 bytes
SHA-256: 4cd0028bcd7d5b338788cc320f76444f4e736a8c61103b4fff4a75c8a830b3c7
font_01_sfnt_off0000785b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 9796 bytes
SHA-256: 2ff481959f090611fa2a528b2e52f0c3de925f7a89b14554452f102fa65cd255