Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad8c9da5c318e9d…

MALICIOUS

PDF

100.8 KB Created: 2021-01-14 10:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5271aa8858fc920af0c190fac0a294ea SHA-1: e636b8679afdbbbe4353b7725c9067fb02f11674 SHA-256: aad8c9da5c318e9db0fe96ef44eb9623689a1a6902cac6cf833cdd1f51cefc29
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many of which are disguised as SEO content, and one specific URL points to a potentially malicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or malicious content distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://trafffi.ru/123?utm_term=zelda+ii+the+adventure+of+link+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366360/normal_5ff349f82a1fe.pdfIn PDF document text
    • https://cdn.sqhk.co/mejabutumu/3XbrT9a/buxaf.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/standoff_2_download_pc_utorrent.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/dBQgg8n/92205585538.pdfIn PDF document text
    • https://ponitunol.weebly.com/uploads/1/3/4/7/134747778/vilija.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/purawuma/24008716482.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/android_accessibility_services_turning_off.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/police_report_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/petotagisosifolaramokul.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/48904545362.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16776 bytes
SHA-256: 0dda32d746f3aa431e6ac1c0e7beb6e0ecc61e39d613c7f2b53a2d6c58991c3a
font_01_sfnt_off00014da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA8 4988 bytes
SHA-256: fabef0cd51831b2aedae2f53d4ed5a3cf32e0999f121a34d2e7dded2712d4e9b
font_02_sfnt_off00015ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAD 11920 bytes
SHA-256: 41e204391193b5280dfb1530e19686aba61fe557cb35e96c84d1142b1727cec9

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