Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5ac8438bf7eb78…

MALICIOUS

PDF

74.6 KB Created: 2020-12-06 23:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 906751eb56e990aed9bf6d196b8f084e SHA-1: 2f6e6a1afe6670b1238743b190ec0705fdb28484 SHA-256: 0c5ac8438bf7eb78729194fcba3d74d0aa2edeef1525f915ffb6175191bb9517
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/strik?utm_term=stronghold+of+security+location PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494669/normal_5fb56c7c0dc88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5f9541a7e63b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404520/normal_5fc59c4f616ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468843/normal_5fa4d7003c09e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fc8eae433e02.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/6765639.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/demajawugijudo_narasobabuson.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/vujoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_5f94a8030c27e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5fa3b4c064e0d.pdfIn PDF document text
    • https://sibolapitabake.weebly.com/uploads/1/3/4/4/134469628/470027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf7d81491241adc453352/1606219736922/baxagenex.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e6b83dfdd95b60d5131d/t/5fc2d368cb3e0f5771adb2ce/1606603625591/zewedabinoduwawipitivi.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/rijuroratabupuson.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/joxomebuzig.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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 5368 bytes
SHA-256: 1771840c44222f0ffd3670739e839960ac03bceb0f21608d8459142ab0695610
font_01_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10184 bytes
SHA-256: 3e95cb1fb71a040007bac750673ce0cfb0d474c110f5888e56c259455d5a1761
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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