Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c263bca91b09c8…

MALICIOUS

PDF

70.6 KB Created: 2020-11-23 15:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f2fa206fe727d503aa1f4d79a1b7ef7a SHA-1: 1b8d3f9e87399c6067c10a6e08d1b22e5e926594 SHA-256: a1c263bca91b09c8cee4d1ab29544c748df7f53443dde204fa9a25f5ab53e3bc
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (https://cctraff.ru/aws?utm_term=audio+software+for+pc+free). The document body, though heavily obfuscated, contains text related to 'Audio software for pc free', suggesting a lure. The presence of multiple embedded PDF links and a critical ClamAV detection further support a malicious classification. The primary attack vector appears to be a phishing attempt leveraging a document as an attachment.

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://cctraff.ru/aws?utm_term=audio+software+for+pc+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fb963d815ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_5faf3c402daf7.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/2665259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f91a9ae107c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_5fabf9912c8e9.pdfIn PDF document text
    • https://zisogojevup.weebly.com/uploads/1/3/1/4/131453725/3e1424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5fa44d5b2c2e3.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/gidibesuxi/4629224181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4e4029-accb-4187-ad66-bc2aa79f866b/chien_de_chasse_courant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb5c6cd-0376-4a78-ac1e-4172b9343026/jibasejogopuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b953ea6-e86a-4498-8400-3645599bd4ca/brasil_uma_biografia_lelivros.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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 5200 bytes
SHA-256: b0b7581644b6d434cb7eebf455378c25c9ddcf1c96fb6fc3c935461cc85759c4
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 10836 bytes
SHA-256: 14bbafe869709dea448387a54f9d39f42662f7aed6cf0b8ec9d479f3af823f27

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