Malicious PDF — malware analysis report

Static analysis result for SHA-256 cede44cd27ea8c15…

MALICIOUS

PDF

78.9 KB Created: 2020-12-21 21:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 342abea20a90b4b79d831eb2a7b88e17 SHA-1: 5331394a7eedacb1769ee0eafc6afe4344639865 SHA-256: cede44cd27ea8c15eb9a807b64ea83d002d642f91ac477b8ee610de6ef5bc18e
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV also strongly indicated maliciousness.

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
  • 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.
  • 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.
  • 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/123?utm_term=the+other+borges In PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/7147461.pdfIn PDF document text
    • https://vexitibivomak.weebly.com/uploads/1/3/0/9/130969710/momolaliref_vafuz_nevawe_bosos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fcefd9aa5c4e.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/tadavovirepunifijo.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/d25844d13c43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_5fbf2cf0648ba.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/514e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_5fb3891f5d522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_5fd1e7d09d0dd.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/negefazudifila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5845d3dfdd95b60f460bc/t/5fcf221810aae775716a6fc7/1607410202470/the_survivor_rusty_forest_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f93d6d-70e8-414d-8179-cb12259ed86d/voditozotizedinebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2feb9d2-41ac-4557-ac7f-830ec5921a8b/26205170004.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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 4792 bytes
SHA-256: bba1802f6c12158348a3f92470bbfbe3848a7b560f9bc367e1e69f0641181da7
font_01_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 11140 bytes
SHA-256: 3cb9d27fb5f471d5ad9033c1249f6520a4c2edbcd1fbcfd94d2349c881f5142e

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