Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77b9c81ed321b27…

MALICIOUS

PDF

71.6 KB Created: 2021-05-22 21:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dffbcab91e918ad57e651a2defb6ee32 SHA-1: 51f938f3fddad6bc3255587e2d4f36fad8470d8f SHA-256: c77b9c81ed321b271805fc8f0f6e2082866be147cb847890832eab7265e6dcf8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xajibur.ru/strik?utm_term=stellaris+ascension+perks+list PDF link annotation
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/6f8f1e91b0671a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447914/normal_5fcb5e97b3fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_600b130ca2440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fe9a8cfb92e9.pdfIn PDF document text
    • https://repiwolaz.weebly.com/uploads/1/3/1/3/131381539/biwikak_poziburumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_602f21c8309d9.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/vutedaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_601f66459c099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5fde71a06cb25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447663/normal_5ff0aaab8c4a5.pdfIn PDF document text
    • https://futinubub.weebly.com/uploads/1/3/5/3/135328842/afe6b.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/bea98965-f731-47e3-9666-8ea76c024566/pathfinder_2e_critical_fumble_deck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fb2791-c8a7-4dbf-bfdf-c4896cf9be47/how_many_episodes_in_umbrella_academy_comics_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdefa7d0-c90e-4604-8841-56e9f6423c5b/2488219355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c30e240-5078-498c-92bc-c61c3c75f013/90117985244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624b8ee3-6b3c-43ab-b31c-6b0697d47791/zoxajojuzekefifime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d98f6c-44ad-4727-bf78-153981e2b20a/85356641016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1049730a-8958-4d9e-b1af-f804915575c7/73185183804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c489af7b-27da-4ae4-bacd-a5acbe6101e8/vosojonopejuditejodukoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafbcdfd-ec5b-4f4c-983e-c9aeee4dd836/36167666241.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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 5092 bytes
SHA-256: 61042b75760e498a8a5b1253d43091d2355f7057d094ece5260e049b78450dc0
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 10552 bytes
SHA-256: e1915bb42839c7d67d9ed7388dea1c2deecc246b6bdb2d152e1f1ea60198c583

Open this report in the interactive analyzer, or submit your own file for analysis.