Malicious PDF — malware analysis report

Static analysis result for SHA-256 baad8cba406b59e8…

MALICIOUS

PDF

67.1 KB Created: 2020-12-06 20:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d244275a8bdb4937b82cba2caac5b78e SHA-1: dc648a1de1f7ca7cc3eba2e60839bb0995bb6eb9 SHA-256: baad8cba406b59e883ca40190ac76da767254a97f530c3a2a9bc2f6c76e936c8
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=osprey+packs+owners+manuals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476564/normal_5faea52e15464.pdfIn PDF document text
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/2153740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fa9a2adb8c83.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/e24d84.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/1d4a2397ad6f2b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fb753dc5d525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f906d08f3835.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/vupulumiwubam-jovapopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5fbf41727af06.pdfIn PDF document text
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/vubag-ruvegoramasoruk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8bace292d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_5fbcbe3dc4145.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/7074672.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/e1f9db78-1d02-4674-9d12-14a9e7753cf9/22519655243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9738e4-d56d-4fb1-96a2-ee5914548aa6/wepas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e4b44f-3b4e-4704-a321-9775538f97a9/proform_stride_select_825.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_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 5364 bytes
SHA-256: ce40f2a16f7359b3c7aeb66c4f15ab9eef1112bda715785288450b2f0e5f3eba
font_01_sfnt_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 11428 bytes
SHA-256: 3c1256e9c3710cbc6a9ae0971ef9491d2abe03907f5aaedbe0093399b3565451

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