Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ce5dcb07d9846b…

MALICIOUS

PDF

87.2 KB Created: 2020-12-18 00:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b8eb22b93baa8d984eca1c1afee3e611 SHA-1: 155c65b7df6b30d7205175a16ab1633ab31622fc SHA-256: e3ce5dcb07d9846b6e214fa94823ca47ae7898b0face27dd16edbdf9d09af736
156 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 0.9997

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
  • 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.
  • 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://traffset.ru/strik?utm_term=bash+manual+linux PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fc366358262b.pdfIn PDF document text
    • https://mevuponepom.weebly.com/uploads/1/3/4/8/134899748/kopanovu.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/zuden.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485305/normal_5fc51c303328a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f9012f406407.pdfIn PDF document text
    • https://xuzajozobesafod.weebly.com/uploads/1/3/4/7/134718295/8bde1c65af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5fa3e26f63c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fb84845120dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_5fbed1bc495ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_5f978d4baa399.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/temij-xajigebopejun-rojegesifax.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/tizowodifi/40671662274.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/76762117252.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 6264 bytes
SHA-256: 46c5ca3322605ea3afd3d1607556f8e4c8cba79a60bb03d4f70251362336c9c2
font_01_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 4948 bytes
SHA-256: 328322aed18cbea16a15a6eea137544a6ee03e88820d01cf3c6ad26115ba6ae8
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 12388 bytes
SHA-256: 7cbf9a4e1aa6a017c6e42e80d0b366f9aa4a3ffda6e9c5733b6e79feaf3986bd

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