Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ce81063ad3aff9…

MALICIOUS

PDF

65.7 KB Created: 2020-11-17 14:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6d9219a248ce1ba69ce29d65e6d77093 SHA-1: 276c57d3cf15144aad0f9230cd37961319e31cb7 SHA-256: d8ce81063ad3aff9fa074e7d7abe963482fbdc5fffc671bcab3110adf628b829
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9997

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffe.ru/aws?utm_term=whatsapp+app++apk+latest+version PDF link annotation
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/malivafivesonef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_5fa0588d77dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fa46e4b3c62a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f892c8b48c96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fa2a16ac5d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fa5829ae5cd4.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/duderotudufexek-panasuwimegu-zujeni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/coaster_racer_unblocked_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8216d9-22ea-4009-b0cd-1570388cba55/56157024136.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/44089886277.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/44303101573.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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 5044 bytes
SHA-256: 8e91f9403ea292f288b6785348a7bc08f371a7e9d032a5a76d34b0f08f190c3e
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 10400 bytes
SHA-256: f5373bad5084e82197ecc5b3668ce6e8f711f4e256dd59372c26016f0bdeab93

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