Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9e293e72055179…

MALICIOUS

PDF

69.2 KB Created: 2020-12-28 05:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9913dbd06d2042c5950bfffc6d378533 SHA-1: d2cd8539f3197e94348ebda0a37039cad34b9a38 SHA-256: bc9e293e72055179d9103a80d2bdc0f7327abb7d9fe2eb6f9c0aab9fd6f436cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. One of the embedded URLs, 'https://trafftec.ru/123?utm_term=brookland+cayce+high+school+phone+number', is particularly suspicious and likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=brookland+cayce+high+school+phone+number
    • https://static.s123-cdn-static.com/uploads/4470222/normal_5fe1c50aa74c7.pdf
    • https://cdn.sqhk.co/fumazuri/b1jjNJE/usa_today_logo_case_study.pdf
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/3618456.pdf
    • https://cdn-cms.f-static.net/uploads/4484815/normal_5fb9b929e69c5.pdf
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/dekuwokevavodemigi.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/vibabizuzikenuf.pdf
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/e999705127153cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bakoloj/curriculum_evaluation_report_sample.pdf
    • https://s3.amazonaws.com/zafaronivaj/monster_rancher_2_food_guide.pdf
    • https://s3.amazonaws.com/jamuluvuvava/68482325180.pdf
    • https://s3.amazonaws.com/tevigotu/life_cycle_of_a_chicken_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/f62aa6f1-be24-4147-ba78-14d834e02374/vogalomaxikezupilawit.pdf
    • https://s3.amazonaws.com/bajuse/xofomejopurom.pdf
    • https://uploads.strikinglycdn.com/files/6935bff6-c885-45e3-93ab-d4082e1ed9a6/kaletuna.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1cd.bin
a087fb5ce653ccec14d6feafbf05545abe2fc77ee092f63823efc5823b5785ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 5840 bytes
font_01_sfnt_off0000e594.bin
e17f563d02527578bde91daf7c57a05d07b9f64b65ad8e52d36f4dddc9856132
pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 9968 bytes