Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd1b54dd8879fa2…

MALICIOUS

PDF

66.3 KB Created: 2020-11-24 18:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af4a365b742e46d88600cb8c365332a0 SHA-1: dfaca76f249d7c645926a010164a25e3ef64e15e SHA-256: bcd1b54dd8879fa21327bdbae17f62cea9e197c87bbd5b58c77eefd426a81d56
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 0.9998

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
  • 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://traffine.ru/strik?utm_term=grace+brethren+high+school+ca PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381546/normal_5fb2d675d31ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_5fb6ea01b21c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fa8cca246ba2.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f91ddde2902c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5f8c9ac133aa0.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/guburonemotam.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/zuxadol/busetevo.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/54906319967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8212d7bf-950a-4830-84ce-3ba40aff1aa8/napebuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/37037835112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d3f065-c137-4561-b07f-38ad16de7a97/webugonotodikaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f07820a-8bf3-4bcc-9ffd-2222bbff9fa0/capitalization_practice_worksheets_7.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_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 5232 bytes
SHA-256: 74fd74baf8a42096e0d454f93cccd6ff4506871e5f0361589d763d1bc31b3904
font_01_sfnt_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 10320 bytes
SHA-256: 6eeab4c3fa4ae74056f7e407562ec58e55566f575461e1f8c623c22d50ac6d87

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