Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefb0a6d4a71a194…

MALICIOUS

PDF

74.7 KB Created: 2021-03-12 13:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0c1e94bacce44745440f500f3df49386 SHA-1: 7737f93b3ff59a189b10432aa0db8336d0e00c7e SHA-256: aefb0a6d4a71a194ab03db4e6ecca2eaf55241e6c87e9c845a5d1eb2d66ed2f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to a suspicious domain 'xajibur.ru'. Heuristics indicate a PDF link farm and ML classification strongly suggests maliciousness. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains text related to UFC fighter Paige VanZant, likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=how+much+did+paige+vanzant+make+for+ufc+251 PDF link annotation
    • https://cdn.sqhk.co/jiguluzufuwa/aHii9ii/hocus_pocus_3ds_max.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/ejjhcib/installation_electrique_maison_triphase.pdfIn PDF document text
    • http://bebodepana.22web.org/xutopafipepojifixeniru.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/iErX4jf/83301657887.pdfIn PDF document text
    • http://kipivejezijab.iblogger.org/nusaropitejerit.pdfIn PDF document text
    • http://rimiminigi.22web.org/3822595540.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/xupizewuxere/rirapuraj.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/pevorotovatasumojob.pdfIn PDF document text
    • http://naxudafaxe.epizy.com/advanced_manager_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/dilani.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/82920280709.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_6542adbb37754fd8acb074016857a9d3.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_3245e37a3fbc4013bad2d84af4e59d6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/rewonasu.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_d2b130ca257546cab7e77717e3c6e69f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/puvegonupidiguxod.pdfIn PDF document text
    • http://jarewixefokoxem.epizy.com/44958389142.pdfIn PDF document text
    • http://resifidivef.epizy.com/51750995087.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/84698761666.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/86424466428.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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5896 bytes
SHA-256: 1393106558babc3bb5caa6d7a40447c02b97238ec33f7d442e2fad90f2fd5246
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 10964 bytes
SHA-256: 4bf98fca4107c6796eb26eacf540dd75861e311aa63c06931ab191525c2681d4

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