Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87fc6a8aef71187…

MALICIOUS

PDF

75.7 KB Created: 2020-12-02 18:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fbd38effd014e89a5a329b7f6db0da8f SHA-1: d60ddb104c1fbb8abc431a779afb4580b1d6256b SHA-256: b87fc6a8aef71187f7741de4a38cc6ea019e814031e5a1cfeff04ef23536c6c1
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/aws?utm_term=esp8266+datasheet+pinout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fa39ea5af0ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5fb486562bfd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5fbe408a45554.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xujewonagamaxu.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/7c76226a9.pdfIn PDF document text
    • https://jutisopi.weebly.com/uploads/1/3/4/7/134775863/jokomekeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f93de35c78e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5f9aae09ec61e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5f954b3bf2376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f919499e0dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5fc3733ada894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447487/normal_5fc7579fc5aec.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/5fc28ce3085bf90c0e07a8cb/t/5fc4d4329b1ed0353874c65b/1606734902652/743514153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45dc629-1732-4512-8f3c-b6d4c8f4bef6/53800922492.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 5356 bytes
SHA-256: f7ce314eed141f51a7049dc5f592de86f7f408be644d95e19e0ed41edf54bbad
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 11832 bytes
SHA-256: fe73e267684b59922a3b5a65a21d73b741d545d946183990e821546ead3ffbd3

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