Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed851578832484e…

MALICIOUS

PDF

81.2 KB Created: 2020-11-26 00:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 17a7ea1f1318223207904e56e92a3f1b SHA-1: 157dcdc3d6fa786f583da0dc33c7b62f5a2415ad SHA-256: bed851578832484e1b737fcef56b879d6ff859cf1a7ae23686c57a7e74e0a7c0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious sites. One such link points to a known malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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?utm_term=fun+classes+to+take+at+ucsd In PDF document text
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/e7637651c4c57a.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xujewonagamaxu.pdfIn PDF document text
    • https://virusogodunaf.weebly.com/uploads/1/3/4/7/134762125/1579811.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/407dc7df-51cf-488a-bb1e-b7a99bfa9662/mhw_wiggler_layered_armor.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/best_kali_linux_tools_to.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/xamulojidupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920e261c-9d0e-4881-8dc8-367562a81dd8/22708368879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b58bf2-57d8-4798-aec7-5d3894151162/45720361525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42257da5-b867-4e7f-8d65-00ad618a4ef8/restocking_guide_neopets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb99306-32bd-412b-b819-e15836e1da3e/cuentos_para_trabajar_las_emociones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48f05b5-b44d-4641-8939-7a2bf33f2b8c/grumpy_s_fishing_report_seaside_park_nj.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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 4856 bytes
SHA-256: 791ff14bfcbf4181ddcdf5abb34d450269c8a8f9b98a14f44c008c595b03f529
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 11756 bytes
SHA-256: ab42bbd97166d578f802b2d18520df67ad774a5579a5f925e71be182da4c19d8
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 16092 bytes
SHA-256: 3aad8f736d68201c4a8387338ab5b73e899d8d5dbdf6ead162eb48e90402f37f

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