Malicious PDF — malware analysis report

Static analysis result for SHA-256 8128ed7884d40a8a…

MALICIOUS

PDF

65.4 KB Created: 2020-12-20 01:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 51d2b19de33e8be5ee1fed34f66c5aa2 SHA-1: d35b1c4edecedd186b577cecd2a219adff916c7d SHA-256: 8128ed7884d40a8a9df428e35873713bf5ad633d19ac4dca2bc242b42f420da1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points to a link-farming or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=social+inhibition+disorder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8f24091aa8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_5fc21ba0e9c38.pdfIn PDF document text
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/7500932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5faede1ce521c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_5fd9971162de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5fbeb817aa7c9.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/25d02f65.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/d8046256-a315-43dc-a21c-d306952d6671/pisoxobevikokebojejuvadi.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/camscanner_pro_apk_full_2019_gratis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6fd919849b27a00a3c0c7/t/5fd1b530ac13f65f66128f0d/1607578934234/topps_match_attax_champions_league_2020_21.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/24656119304.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/business_letter_format_template_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d418f7f5-1181-402e-bbcd-42b8209ab57e/fepigakasabiliwawimavatam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50d53c6229360ecc78f6a/t/5fd6d87c267c8d0ace58c833/1607915645026/sazifofasufavidebomo.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_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 5272 bytes
SHA-256: 7adcb73d1140f4baf6bb96077d7fcb124a3b2a31b952bfa0b4bf21fa0f137d22
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 10064 bytes
SHA-256: 56f8ebe8bf60a269073e7fa1b5442d93efc6fe813433471a9c451baa2e587e7b

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