Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55280257feda9bc…

MALICIOUS

PDF

74.5 KB Created: 2021-04-22 12:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 26c8d351806f545240bd8358af05dc8a SHA-1: 5d850da6ac1320de6c998e7c0244693d745edae7 SHA-256: d55280257feda9bc836c3009e9897d45d7320e7f98b08f2f8bd5b8dbf2623ad8
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://jottigo.ru/strik?utm_term=what%2527s+another+word+for+monster PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5fffc878bbc6b.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/8526204.pdfIn PDF document text
    • http://jilet2.club/dezegafixefepizadpqcj.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/rokemifulozuneraves.pdfIn PDF document text
    • http://vorecan.space/mawepurawakiwajotexamoravj48w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_5fc639ff326b3.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/7032411.pdfIn PDF document text
    • https://bezumovepefare.weebly.com/uploads/1/3/5/3/135337037/e5aa0225c90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fc60775d2bdc.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/todatogefakepebaxafu.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/towakog/xijolijij.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/54283698900.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/75731202868.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/nowegilu.pdfIn PDF document text
    • http://kagijido.myartsonline.com/96650438045.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/news_reporter_salary_per_month.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/going_concern_audit_report_emphasis_matter_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/weather_report_today_kud_chenani.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/magaruzu.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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 5252 bytes
SHA-256: 0d5761e0b3095c3b2ae9b1317588811a955b998f4516a6344d6228db30f84eb4
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10652 bytes
SHA-256: fcc785d5c6a5f2713b3381f42fd6b2e3327dd1a339dec42b314847a7924e7a26

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