Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a71cb00b9ccbc2…

MALICIOUS

PDF

67.6 KB Created: 2020-12-21 20:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e372c94ff7ec9843f861a92138abc43 SHA-1: cafc8af0b309e8aba984387f8be3110fe6d2de8e SHA-256: 23a71cb00b9ccbc2627c465c16479fedf4d59d6a0c1d3375d2f926a9ddec52cc
154 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 0.9541

Heuristics 4

  • 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
  • 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://trafficel.ru/aws?utm_term=dominoes+game+app+for+android PDF link annotation
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/vufovebojokunid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fb4600de7824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_5fa36502712ff.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/vezosoluvezoj/muvep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1057f405d5340f32a3beb/t/5fcd1e291e1a4d7de131d19e/1607278124507/52141444541.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/riderufalavifi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc783de43c5ee75bf2ca8b2/t/5fccf9ce5d2e6f3bda3f0967/1607268816017/assistant_principal_jobs_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/sedaruronufudazogeneja.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/6043399065.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/love_of_my_life_piano_sheet_queen.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/33412636243.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/calories_in_food_chart.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 5036 bytes
SHA-256: 835e8e7f6d217e8b04995975e826348b04a737e4002921193d804178e513e833

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